Wow, so my datadir went from ~7GB to ~13.5GB.
Is there any of this that is deprecated and can be pruned? I regularly backup the entire datadir and having it double in size in one day as opposed to over a couple of years is kind of harsh.
You can remove blk0001.dat, blk0002.dat, blk0003.dat and blkindex.dat from the data directory after a reindex is complete and you are caught up with the blockchain (and you don't plan on going back to an older version). Only blkindex should actually be using disk space, as the old BLK000x data are moved upon upgrade, and the blk000x.dat files you see there are hardlinks (shortcuts) on any filesystem that supports hardlinking.