The BlackBerry PlayBook developer beta OS 2.0 has been updated once again. This time its version 184.108.40.20649. As of right now there is no change log, but users have been reporting the following changes and enhancements:
improved browser speed,beating all tablet browsers including iOS 5
implemented A2DP (Headsets, audio devices)
updated App World, now includes swipe-down menu bar that enables Help & Payment Options
upgrades for Bridge connection
undefined Media enhancements
LED notifications, has a new setting called Sounds & Notifications
The browser seems to be the biggest improvement as it scored very high on the HTML 5 tests.
If you have not registered for Beta OS 2.0 you may do so here.