I'll be playing 3.5 with at least Pathfinder, Ptolus, a few of the old Goodman Games books like the boxed sets and I have a lot of other little adventures I'm going to be tying together to make some campaigns.
I will however, be stealing various bits from 4e like the new Toughness and the Death and Dying Rules and maybe even the elimination of Diagonal movement penalties.
Further, time permiting, I don't imagine myself sticking soley with 3.5 anymore in the future than I do now as I still play Warhammer FRPG and Fantasy Hero (and with my recent purchase of the old Rolemaster Classic, would love to get back to that.)