According to a (now deleted) Facebook post from the Scribblenauts Unlimited page (which Joystiq has reported on) there will likely be a Warner Bros. Humble Bundle on the way which, according to said post, includes Scribblenauts Unlimited and five other WB Games.
Not sure if this will be a main bundle (which tend to last for two weeks and add a couple of new games in the second week) or a weekly one (which means it won't be up until Thursday at the earliest) but it's implied that it might be coming today since the Facebook post mentioned you could pick it up "now," though obviously the post was premature.
Edit: It's available now on the Humble Bundle website. Pay what you want for Batman: Arkham Asylum GOTY, Fear 2 and 3, and LotR: War in the North, or pay above the average price for all that and Scribblenauts Unlimited and Arkham City GOTY. This runs until November 19th.
There's a possibility that, since this is a two week deal, there will be a couple more games added in a week for those that pay the $6 for everything, so keep that in mind.