It will most likely end up in the hands of the Spoon Project. http://www.spoon.as/
They are a solid group of very good talented, experienced flash and flex developers that have already been working on an open source fork of the Flex framework. They are eager to take it on.
I don't know if this will impact the ESRI Flex API roadmap. Should make for some interesting discussion at dev summit next year.
My interest in Flex development has been waning this year and that is reflected in the direction I have been taking development of upcoming projects in my agency. I would very much like to see Flex thrive as a fully open-sourced project though. Afterall, Flex is how you build AIR apps, and AIR is very much a viable solution for mobile development.
