Bit behind the times. Available Now: Java SE 6.0 Release 1 Developer Preview 1 (Intel) "We have just released Java SE 6.0 Release 1 Developer Preview 1 and it is currently only available for Intel-based Macintosh computers. We will be releasing a DP in the near future for PPC also. We just wanted to get 1.6 out as fast as possible. It is available at the usual location of http://connect.apple.com. Please give us you feedback."
Via, Mac Java Community.