what was the point in the Reach invitation inside ODST?

please don't block this! so when I opened up my copy of ODST, I saw a slip of paper with the box art on it. what was the point? there wasn't even a code of some sort to put in. although, I did see something at the bottom of the game menu that said something like "are you prepared to drop?". anyone have any ideas as to what the point was?

The beta will probably be an update into the menu next year... but I'm just guessing.

ya it should pop up in the menu when they release it. they just showed the little card with "halo reach" on it to showcase that it is coming.