Pre-orders and previews underway ahead of launch.
Psystar's Mac Clone Offers Blu-ray and NVIDIA 9800GT Options
According to the FAQ, Mac OS X Blu-ray support is limited to to read/write data capabilities only and there is no Blu-ray software capable of playing back Blu-ray video on the Mac. Apple had described the licensing of Blu-ray as a "bag of hurt", but was likely referring specifically to the video playback licensing issues.
The two peripherals are build to order options from Psystar. Two weeks ago, Apple and Psystar agreed to Alternative Dispute Resolution (ADR) in which both parties can try to work out a resolution rather than going to trial. The process may still require several months.