Memo to self: add "Do not build for platforms which could pull the rug from under you" to list of tips for founders with day jobs. That sort of thing would crunch my business like a tin can if it happened to me in the wrong week. (Actually, I think all weeks are the wrong week for something that big.)

Facebook has done this at least three times previously. This time was better than previous because they actually laid out a roadmap with specific dates.

http://wiki.developers.facebook.com/index.php/Developer_Road...

So, anyone who hasn't factored this into the development model yet is, well, dead or going to die the next time it happens. :)

This is why the game I'm currently working on is built using facebook iframe/connect, and not fbml; the thinking being that this product should be able to stand on it's own merit regardless of which API i mash into it.