Not many--most are either solidly Democratic and will stay that way (WV, AR) or the reverse (OK, FL, etc)
If anything, the Democrats will likely make big gains in NC, TX, and FL.
Mississippi will be the only one the Dems lose.
Yes I have a feeling NC could flip back in 2012. Note that the NC constitution forbids unnecessary county splits in state legislative districts, so the legislature can't really be gerrymandered. If FL gets successfully de-gerrymandered, then there should be several Dem pickups, but not nearly enough for a majority.