I'm preobably reading way too far into this, but I find that this is worded fairly specifically.
Now, the general speculation right now is that the Ridley Scott feature is going to be following Mike Colter as "Marlowe" and that this character is also the unnamed spartan on the Visual ID art released last week for Halo 5: Guardians.
Back to the Bulletin, What if the reason that the team keeps wording halo 5 that way and referencing a 2014 Halo release because the next halo release we'll see is a small back story for Marlowe? Of course, IF this were the case it would essentially be what MGSV: Ground Zeros is for the Phantom Pain, but it would be cool to release a game to support this new character. It would be like if they released the Arbiter half of Halo 2's campaign as a small stand alone.
I feel like they could do this alongside a Halo 2 Anniversary as kind of a Spartan Ops style "demo" campaign.
(Frankie, tell me I'm reaching if this is ridiculous)
I don't necessarily want this to happen, it's really just speculation, but it really could be interesting.
TL;DR: Marlowe could get a game before Halo 5 comes out.