From the Reddit post Please 343, incorporate community Forge maps into matchmaking as soon as possible.
B for Bravo had this to say
> bravo343 253 points 13 hours ago
>
> Yes indeed - conversations (and work) are both well underway between the Forge, Multiplayer, and Community teams on this sort of goodness.
So those of you who are hoping to see community made maps in Halo 5. We will get them eventually