I would expect the new version 'DVD Studio Pro 4' to support blu-ray. At least Compressor 3 is mentioned to support it:
http://www.apple.com/finalcutstudio/compressor/
'Use Compressor 3 to create files for delivery on iPod, Apple TV, the web, DVD, mobile phones, and next-generation Blu-ray and HD DVD discs. '
But maybe Phloyd has some more info from over at NAB?