It won't be that larger than Galaxy S. Though S2 screen is larger at 4.27", the outer area around it is smaller.
I don't take that early benchmarks by them seriously any more. That was just early proto-type with unfinished drivers. I'm sure it will beat Tegra2 in most categories if not all. The only worthy competitor to it is TI OMAP4 in my mind.
I am positive that it's a larger phone.
I'm still worried about the battery life too... Guess we'll have to wait 'til it comes out before we know for sure.. I might get an extended battery for it anyway. I don't care if it makes it thicker.