The next version of the Flex SDK, codename Hero, is available to you for download now. If you want to check this special builds just go here and download.
What is so special about Hero? Well, the most important thing is the added support for mobile development. So far you’ll find in this builds: Spark DataGrid, Spark Image, Spark Form, OSMF 1.0 integration, Mobile Application, View & View Navigator, and ActionBar. You can read more here.
No go and start play with it already :D!