The Flash PM Richard Galvan has commented on concerns raised by Flash users on his blog, as follows:
http://blogs.adobe.com/rgalvan/2009/01/concerns_and_issues_with_flash.html
It outlines some of the main things we are currently looking into and working on. Please see the above post for more information, and we of course welcome your comments (if there are specific issues you have, files and very detailed steps to reproduce and system specs are very important).