It isn't 100% decided yet, but their community is shouting for it under the preface that it will allow the team to make money.
Discussion thread: Here
http://sourceforge.net/projects/construct2 <- Source
Seeing as it's Windows only at the moment, I can't really say I'm suprised, but it would be really nice to have a foss HTML5 game creator, and getting it cross platform would require a rewrite of quite a lot of things anyhow. So, the question is, anyone willing to fork it?