Survivor has been targeted for the hardcore fans almost exclusively for the last three or four years, so the "haven't watched since season 3" crowd need not be bothered.
I think the effective "teams of two" twist is great, that's going to lead to some really new and interesting alliance dynamics. I'm upset they're bringing Redemption Island back, though, it's such a waste of time. The weirdness about being able to switch places with your loved one makes it even worse- I can already picture Rupert's wife getting voted out early, and CBS spends an hour of the next three episodes talking about how heroic his decision was and about his noble journey for redemption, blah blah... it's not part of the true game and wastes episode time >_<
The teams with one older and one younger member are going to be very interesting, I feel like they will either all go first or all go far due to being included in both of the typical "young" and "middle aged" social groups/alliances that form early. My bets are on Gervase and his niece since they will have that social edge, and won't be seen as threats.