May weeks will probably still be deposited for DVC for a little while after the 1st of the year---assuming they follow the same patter with RCI that they did with II (a big "if"). Wyndham has already banked through August '09. Usually, they only bank "forward", but every once in a while when owner demand runs lower than they expect, they'll bank "backward". Some Feb/Mar '09 Bonnet Creek weeks were put in a few days ago.
I would start an ongoing search with Bonnet Creek now, and add the DVC resorts as they are added to the directory.
You will need a pretty decent trader to see either, even in May---which is generally a slower time for Orlando. If you get to 50-60 days in advance, consider widening your search.