OS X Lion - Developer preview now availble.

[muzzle79]

One big notable feature, no more separation between OS X and OS X Server, it's all in one.

http://developer.apple.com/technologies/mac/whats-new.html

Mac App Store

Mac OS X Lion includes the Mac App Store — the best place for users to discover, purchase, and download your apps. Millions of customers in over 90 countries can quickly and easily select from some of the best Mac apps conveniently on their Mac. Learn more about the Mac App Store and how you can introduce your apps to millions of users around the world. Learn more
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Full-Screen Apps
Full Screen Apps

Provide an immersive, focused user experience with a full screen app. NSApplication, NSWindow, and the NSWindowDelegate Protocol in Mac OS X Lion make it easy for you to create and manage full-screen user interfaces while providing you the power to design rich user interactions.
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Aqua

Aqua defines the look and feel that users come to expect from Mac OS X. Lion takes this experience and brings it to a new level with popovers, overlay scrollbars, and powerful Multi-Touch gestures and animations.
Popovers
Popovers

AppKit framework now includes popovers, a new unit of content that can be positioned relative to other content on the screen. Popovers automatically move whenever the positioning view moves. You can also design popovers that can be detached, allowing them to become a separate window.
Overlay Scrollbars
Overlay Scrollbars

Mac OS X Lion introduces overlay scrollbars similar to those in iOS. These scrollbars appear as an overlay on top of the window's content while the user is scrolling and remain visible briefly to allow scrollbar dragging.
Multi-Touch Gestures and Animations

The fluid, responsive animations that create the magical user experience on iPad and iPhone are available in Mac OS X Lion. Design your apps to use Multi-Touch gestures and animations and redefine the interaction users have with your apps.
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AV Foundation

AV Foundation framework provides essential services for working with time-based audiovisual media. Through an Objective-C interface, you can easily play, examine and compose audiovisual media in your app. An array of powerful classes also make it simple to edit and encode media files. You can even capture audio and video from external devices and manipulate them in realtime.
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Auto Save and Versions
Auto Save and Versions

If you have a document-based application, Lion offers an efficient, built-in auto save feature that stores changes to the working document instead of creating additional copies on a disk. Versions automatically records a history of changes made to your documents and lets your app display a Time Machine like interface so users can browse through previous versions.
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Resume

Resume in Lion allows users to restore your app exactly where they were prior to logging out or restarting. Apps that were last running launch automatically and all open document windows return to where they were. The system automatically manages apps and conserves resources by closing apps that are not being used.
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Sandboxing and Privilege Separation
Sandboxing and Privilege Separation

Create apps that are more secure with app sandboxing and privilege separation. Sandboxing protects the system by limiting the kinds of things an application can do, such as accessing files on disk or resources over the network. Limiting the capabilities of an app to just those operations that it needs to perform helps keep the rest of the system more secure in the event that an app is compromised. Privilege separation is another common technique for improving security where an app is factored into smaller pieces, each with their own distinct roles and privileges.
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File Coordination

Coordinating access to files between multiple threads and multiple processes can be difficult and error prone. File Coordination helps eliminate inconsistencies due to overlapping reads and writes by allowing your application to access files and directories in a way that is serialized with respect to other processes' accesses of the same files and directories.

 

[450]

Makes sense that OS X server is gone, I mean there isn't an Xserve any more.

 

[Arcygenical]

Yay, OS X server and Client in one package? I'm sure the install size will only like, quadruple or so.

I could never dream of using a stock OSX install on an SSD, so thanks Apple, for all the crap you package with your OS... And I'm not just talking languages or iDVD.

 

[450]

Yay, OS X server and Client in one package? I'm sure the install size will only like, quadruple or so.

Maybe the server packages won't be installed by default.

EDIT: I mean, xCode isn't included by default.

 

[ryken]

Resume in Lion allows users to restore your app exactly where they were prior to logging out or restarting. Apps that were last running launch automatically and all open document windows return to where they were. The system automatically manages apps and conserves resources by closing apps that are not being used.

very interesting.

It seems overall that Apple is taking a lot of inspiration from iOS in their design of Lion. Hard to say if this will be for the better at this point, but I'm always open to new ideas.

 

[valve1138]

I wonder if the server components will be available at the Mac App Store.

Although if they just lump it all together that would be sweet too.

 

[muzzle79]

the server components will be on the single media.

It's under customization options during install, so i'd imagine it'd be the same RTM.
Lots of updates and changes that haven't been documented yet, some subtle and some not so subtle.

I will say that there is a nice new feel to all the aesthetics too, love the new scroll bars.

 

[phide]

Built-in support for sandboxing that any application can run through? Microsoft, take note.

 

[milimetersquared]

Not wild about them getting iOS in my OSX, but, hey, what can I do? Some of the features look cool, and would work great with an SSD.