What you seem to be forgetting is, we don't know anything yet. Naruto's new technique may not be perfect. There's always a counter. That's what makes this series so excellant. It's (usually, anyway) unpredictable. We might get tossed a curveball. In the end, as stated before, Sasuke could end up dead. Or Naruto. Or everybody could die in an epic landslide of chocolate pudding.
... Okay, maybe not that. But, you get my point. XD
And, on Pein's new body, I get the feeling it's just a really effeminate dude. The face really isn't all that girly, just kinda young. I guess we'll find out when we see its shoes.