If you absolutely need to build a system now then hold on to your order and stick with the V1.1.
V2.0 is obviously going to be better, if you're willing to wait for it. Whether or not you are willing to wait for V2.0 is completely up to you and you have to pit your time against the possible improvements.
@Wahaha360 seems excited about it so I think that the improvements are going to be substantial, at least that's what it looks like from my POV.
Personally, I canceled my order instantly when the 2.5 and 2.75 slot options were mentioned as I think that will open up a lot of water cooling options (and air cooling options). I think it's worth the wait even though I initially placed my order in august (November batch). More information will trickle in once the design is finalized. If you're on the fence then you're already leaning towards canceling your order, since you're questioning whether or not getting the V1.1 now is worth it.
Again it's your decision to make but it seems like V2.0 will have some exciting improvements that I personally would wait for. If your current setup will hold you off until V2.0 then I'd suggest you wait (just like the man himself said)!