The Halo: Reach beta is launching this spring, and Bungie is expecting massive participation. The studio predicts an upwards of three million gamers will be playing the beta. To put that into perspective, the Halo 3 beta, which came with every copy of Crackdown, had about 800,000 downloads.
The Halo: Reach beta releases in May and will be available to those who purchased Halo 3: ODST.