I'm holding off....
Gotta see what Canon brings out soon. Would I trade a little image quality for IS on the 35/2 ? Probably.
Would I get a 50/1.4 IS before the 35/2 IS - hard choice. I'm a real "35" type of shooter, but, I've got the 16-35 and the 24-105 that both cover that range - and the shooting I do with the 35 is mostly for social events, and I'm getting to appreciate the flexibility of the zooms. Tough call.
I'm gonna hold out, see what they do... if there's no 50/1.4 IS coming soon... I'll probably do the 35/2.0IS.