On one hand I ask... 'Why, on the cusp of the introduction of the new API?' It seems like one would want to wait and see where Mojang goes with their API on the off chance that they get under the hood and start moving stuff around. Stuff you already took into account when you made your changes, thus forcing you to go back and rework.
But on the other hand, maybe this is forge getting away in anticipation of Mojang's changes.
If I remember right, Mojang is going for a bukkit like API, Server Only, which means that there is still a serious need for Forge.