I haven't kept up with the rumors but I guess a HDD bump is possible but not likely. I doubt the DVD burner upgrade for the base model will happen. And the LED backlit LCDs are possible since rumors on that have been floating around for a bit. But if no refresh happens I wouldn't surprised since they have been upgraded not too long ago.
Yeah it isn't that long since the last refresh, but if anything is going to be upgraded it'll be during macworld, so I'd definitely hold out a few more days
Hold Out! I know its hard to, but just wait. I'm so ready to order my new Macbook come Tuesday that I ordered the aftermarket RAM today at Newegg. I'm ready to mkae the switch and finally see what all this scuttlebutt about OS X is.