My reasons for not waiting on the Galaxy S2:
1. Don't like Touch Whiz: Very important to me since the UI is something you deal with every day.
2. Lower resolution: All new super phones get qHD resolution, not sure why Samsung skimped there. Yes, the Super Amoled plus looks very nice, has better contrast, and might even be more energy efficient, but I prefer the higher resolution and correct aspect ratio of the screen for movies
3. No 3d. Yes...I know, it's gimmicky...but so was having an internet browser on a phone a few years ago. The 3d just adds an added layer of stuff you can do with this phone, it adds value, it distinguishes the phone and I suppose it has some wow factor....if you really need to impress your friends I suppose.
While the Galaxy S is a fast device with a great looking screen, that's about all it has going for it. I don't like Touchwhiz, and it has nothing besides the screen that makes it stand out from the crowd. I suppose it's a benchmark junkies dream come true.
I am not ready to judge the Evo 3d's camera until I used it myself. While HTC really doesn't use the best camera hardware in the world, the software does help a little to make the pictures look better. I for one was never unhappy with the Evo 4G camera, but then again, I am no photo junky either.