Apple seeded the first test build of OS X 10.9.2 (13C32) to registered Mac developers, available through the Software Update mechanism in the Mac App Store as well as through the Mac Dev Center.
Everyone else interested in testing OS X 10.9.2 (13C32) without being a registered Mac developer can download OSXUpdCombo10.9.2.pkg with help of: https://swscan.apple.com/content/catalogs/others/index-10.9seed-10.9-mountainlion-lion-snowleopard-leopard.merged-1.sucatalog.gz
AppleHDA is still working with my New style of AppleHDA.kext patching, even after being updated to version 2.6.0a12 so that is really good news. But no. I have not checked FaceTime audio. Not yet.
And yes. The Mac Pro images are now available. Finally. Look here.