3.0 beta is coming out supposedly late August early September for us to start using on our production websites. Do not use 3.0 Alpha editions for your production website. I’m looking forward to what kind of changes they put in with this major release. They do mention that if you are currently using , that you should wait until Joomla 3.5 comes out to ensure all the bugs and kinks are out of the system first. Plus only has a 30 day support window as initial bugs and fixes will be put in place.
If you are using, there is a long term support plan until a tentative September 2013. You can see more of the development on Joomla’s homepage.