TeamSpeak has released some more information on their upcoming TeamSpeak 3 client, posted on their developer blog.
Especially an overview of the new architecture seems interesting.
At the time of release, TeamSpeak will release the main QT user interface, a console interface (lua) and of course the server, to Windows, Linux and Mac.
What keeps my interest for the development, is the ability to use ALSA in the next TeamSpeak version. That alone would be one major improvement over TS2.