A few minutes ago we just posted a preview on Adobe Labs of the new ActionScript Compiler (ASC 2.0) as part of the AIR 3.4/FP 11.4 SDK. You can find the complete release notes here. To fully utilize this new AIR 3.4 preview SDK, make sure you use Flash Builder 4.7 Preview also available here, which includes all this, plus things like Concurrency (ActionScript Workers) support for debugging and more.
// Missed that as well. I should stop going on vacations...//