I dont need to wait cause i already know the answer for me atleast

I'm extremley happy with my S3 for a few reasons:
- Great SW update coming from Samsung
- SD card rocks, never going back to only Internal memory
- Touchwiz and samsung tweaks are also awesome, they add so many good features like the smart stay and all the options in pull down menu. Plus Touchwiz isnt a power hug, it feels smooth.
- I live the button (hope they dont remove it on S4).
So the answer is simple i go for S4 even if it pains me move from S3 so quickly, its a great power house still but the geek i am i know just have to upgrade
ps. I also have iPhone5 and can agree aluminum give a more premium feeling but i still think S3 has other benefit like being really light and the fact you can change the cover when its scratched is a plus for me. So in the end of the day i prefer the plastic.