Yeah sort of.
The White Soapstone is split into 2, the White Soapstone, and a small white soapstone. The small one allows you to be summoned as a "Shade", a grey phantom for a short period of time. The large one allows you to be summoned as a normal "Phantom", but you are also on a time clock and could be sent back to your world before fighting the boss of the area summoned, if you take too long.
I don't know how I feel about that yet. Got sent back from a summon right when we got to a boss fight last night, and I was not a shade. On the other hand, it seems like Shades are good for sections of levels(since they go away quickly), and Phantoms are for the boss fights.
I can't believe how many people are online. I am summoned in seconds, EVERY, SINGLE, TIME. Good riddance GFWL indeed.
I believe the summon limit for being a shade is 5 minutes. After that, you are returned to your world. I've used it only a few times and the reward is a smooth & silky stone.
The prize for successfully aiding in a boss defeat is a Token of Fidelity. This is a required item for dueling other covenant members in Blue Sentinels. Each win counts towards your rank while each loss does not. For Brotherhood of Blood, each loss will count against your rank, but the duels require no item and are unlimited.
The time limit for a regular white soapstone summon has to be at least 20 minutes because I have never gone past that time.
When invading as a blue, you are booted after 13 minutes (sometimes the invadee will use a chameleon item or spell and just hide).