Actress, comedienne, and weapons expert, Aisha Tyler, is ready to get you up to speed for the Halo: Reach multiplayer Beta. Her introductory battlefield tour is available right now, exclusively through Halo 3: ODST's main menu, the very same place you'll get be getting access to the Beta itself on May 3rd. Pop in your ODST campaign disc and look for "Preview the Beta" in the main menu. Once the Beta is live on May 3rd, the text will change, prompting you to "Play the Beta."
One small note about the Welcome to the Beta video: our test team tells us that there are a handful of players who may not be able to access this video through ODST for reasons that are way too complex and technical to get into. Likely, you won't have any issues. The reason we bring it up is so you won't freak out in the unlikely event that it does happen to you - even if you aren't able to watch the video, you WILL still be able to access the Beta itself through the ODST main menu.