Today a new client version, called 3.0.0-rc1 has been released. As it is a client from the "stable channel" all users coming from beta36 will be asked to update to it through the auto-updater.For those of you that have not been keeping track of the development of rc1 by using a "beta channel" client (the 3.0.0-rc1-preX versions), there are many changes. The biggest and most invasive is the complete rewrite of the sound system, giving better performance and more possibilities in many areas. Also quite prominent to note is the updated sound pack (TeamSpeak is still working on the effect filter).
If you have any issues, please report them in the release thread in the official forums so they can address them before the final version is released.
