What will carry over with the 2.0 change?

Hello,
I read all the SE posts on 2.0 and it made me wonder:
Does anyone have any insight as to what will carry over from our time invested in our accounts and characters pre 2.0 (and not just carry over but still be relevant). Are there things that would be an absolute waste of time to do now in preparation for the complete change in 2.0?

Gear-wise, there probably isn't any incentive to go for top of the line gear before 2.0. As far as class levels and such though, you can't go wrong.