Honestly guys, I dont think this is anything big. However, i do think that it could potentially lead to something big!
It looks like someone sent a message from Reach to Onyx. I see important dates prior to Reach's destruction, and the discovery date for Onyx but that may be used just for ID purposes.
Edit: Actually, I dont think we know exactly what was going on during the dates listed on that thing. They seem to be between the important dates we already know of, but I could be wrong. Dont feel like looking them up right now.
If someone could find out what DDR and HABBA stands for, it might lead to more clues. But as of now, I dont think they're giving us much more info other than what we know. Its more likely a teaser to something that we can glean some new info from!
[Edited on 09.09.2011 3:21 PM PDT]