As Adobe’s Hironmay Basu states – he’s working in the LCCS group -, the acoustic echo cancellation for Flash Player will land around June this year.

Firstly, its part of 10.3 ( I guess 10.2 is more of a patch) as I was informed by the player team and this will come around june( as per my last info). We are going to put it and update you once a stable build of 10.3 is available and whenever its available, we will try to get it simultaneously in LCCS.

Adobe Forums: Flash 10.2 AEC…
Related ticket in Adobe’s bugtracker.

If you haven’t hear about this stuff, I really suggest to Google it, the whole story is quite twisted and a bit funny…