May be coming soon, may be not
AppleInsider has a rumour that Apple and Sony are in the final negotiation stages for bringing Blu-ray drives to Macs.
Third-party Blu-ray drives are available but not an Apple-branded drive.
Apple-branded Blu-ray drives have been mooted for Macs for a couple of years. It has been assumed that the HD-DVD-Blu-ray marketing year prevented a decision being made but that obstacle, if it was real, has now gone away.