Finally, version 3.00 is just around the corner. Version 2.99 has everything the final version 3.00 will have, but I hope that users will find at least some of the bugs before version 3.00 is published.
So, if you a bit advanturous, download version 2.99 of beamer and version 0.63 of pgf (and, if you have not done already, xcolor 2.00). Your old presentations should compile fine. If they don't and you did not do anything wicked, please tell me.
Once the new version has stabalized (in a week or two), I'll release the official version 3.00.