I don't know how old this is (I avoid IGN and other game news items) but looks like Halo 4 is slated to come out in about a year.
Halo 4 Trailer (E3 2011) - YouTube
I'm iffy about it. I was a early fan and kinda stopped playing the series after 3. Never played the RTS. Didn't Bungie hand the torch over to some other production company after Reach?
I guess I could google it all, but figured I'd share the vid