When will we see the continuation of the Master Chief story ending Halo 3?

[sguy78]

CommunistHater said:

voty2000 said:
I think a new Spartan should appear in the Halo 4 and then Halo 5 the new Spartan and Master Chief team up and the developer creates the best Co-op experience of all time. I can dream.

this would be good for sales of the next box.  launch with a new guy then master cheif comes back

I don't want to wait that long to get to play as Master Chief again.