If you can’t wait for the official PC-BSD 1.4 release, go and download one of the triweekly ISOs. The last ISO (02 June) now includes Xorg 7.2, Beryl, Nvidia drivers and a lot more.

Please note, this is still in alpha development, so don’t be surprised if you come across problems and bugs etc. If you find any, please send them to the Beta Mailinglist.