OS X can't play Blu-Ray DVDs yet, (though VLC can, I wonder if anyone has a Blu-Ray disk and a Blu-Ray drive installed on a Mac that could let us know?).
As far as I know, all OS X can do is burn to Blu-Ray as a large storage medium.
As for Blu-Ray drives for the MBP, they do make Blu-Ray drives that would fit in it, but again it would only be useful for storage, not films.
Steve Jobs has been quoted as saying licensing for Blu-Ray is a 'bag of hurt' or something similar.