Bungie has special surprise planned before Halo 3

[naznatips]

ClaudeLv250 said:
HALO 4 5 AND 6, THE NEXT TRILOGY

Yeah pretty much.  Halo 3 is it for Master Chief.  That doesn't mean they aren't going to make Master Commander and do the exact same thing again.  In fact, I'm sure they will.  It's too profitable for them to stop.