You will have to buy an external bluray drive, and I'm only aware of one designed specifically to work with Macs, which didn't get the greatest of reviews. Apple was in the HD-DVD camp and still pouting about bluray winning. Don't expect to ever see a bluray drive in a Mac. Apple is slowly extricating itself from the computer business as it is, and so by the time the DVD format more or less went away, they'll probably only have one or two MacBook Air models left for sale which don't have optical drives anyway.
Apple still make their computer not support Blu-ray natively. I tested that the newest VLC media player, it says that the movie can not be decoded. Also the Mac Blu-ray player and the DVDFab media player, both of them can play my Blu-rays. But which one to choose? any suggestions