There is a very cool Easter egg in the original Halo: ODST that you might have heard about. Hidden away in the game is a poster that secretly outted Bungie's new franchise five years before it ever hit stores. Of course, no one knew that at the time, but it was a neat revelation after the fact.
For reference, here it is in the original game, stating quite clearly, "Destiny Awaits"
However, go find that poster in the new version recently added to the Halo: Master Chief Collection, and it has changed, just saying "For Her":
It would have been cool to see this in a new remaster as a sign of good faith to Bungie, but alas, I'm sure this has been changed do to some legal ass covering from one of the sides. Alas though, you'll have to slum the 360 version to see this Easter egg in the future.
Side note: Could 343 be pulling a fast one on us again and talking about details of Halo 5? Who is her? Could it be Cortana, who was (SPOILERS) sort of killed off at the end of Halo 4? That would be neat.