http://www.apple.com/macpro/
Their new high-end tower is available for purchase online, and even though it offers all sorts of expensive additions (such as the option to have *two* 16X SuperDrives), noticeably absent is the option for the inclusion of a Blu-Ray drive.
Given that this is Apple's high-end computer, this does not look favorable for an imminent announcement that Apples will begin including BD drives in them. At least, not for the near future.