engadgethd.com is reporting shipping in september...
One thing to keep in mind, for those wanting an integrated BR player on the 360. Using GTA IV as an example, doesn't PS3 require a 3GB install the HDD? That's because BR has slower read access? The 20GB 360s are going to fill up fast. Who wants another device w/ a power brick? I don't. But M$ may not have a choice. Unless they make the 120GB version standard.
"As we have stated, we have no plans to introduce a Blu-ray drive for Xbox 360," a Microsoft official said, "Games are what drive consumers to purchase game consoles, and we remain focused on providing the largest library of blockbuster games available."