Many EU servers have seen a fair amount of housing become available again now that their free transfer period has ended. The preferred worlds for NA, and possibly some of the standard worlds, should see something similar happen.

Keep in mind this doesn't mean you're going to see it when the servers first come back up. You're going to see it closer to the end of the free transfer period. You'll also see more become available throughout May as auto-demo starts kicking in on those houses owned by players who have quit playing.