Remember when RB2 was launching?
There were dozens of threads asking about the release date because HMX never announced when it would be available for the 360. It actually came out on a Sunday, and they didn't officially announce it.
A bunch of us 360 users were begging HMX to just let us know when the game, which was already announced to be released in September, was going to be coming out because at the time there were three or four possible dates announced by retailers.
They never did announce it(much like the RBN store). It showed up, and THEN they announced that it was available.
So don't think you're alone in this lack of information. It happens to all three consoles.