Halo: Reach --- Where is the download?

I bought Halo: ODST when it was first released, not so much for the overpriced DLC quality content but to make sure I would be able to play "Halo Reach" when it was released. Everyone has been saying for months, on May 3rd, load the number one Halo: ODST disc and you’ll find a link to play. This morning I loaded it and no Reach download. All I get is a link that says "Preview Halo Reach" which is a video. Where is my Halo Reach?