What will come after Spartan Ops?

So …
… what you think … ?
What will be after Halo 4 - Spartan Ops ends?
Will Spartan Ops be for Silver-Members aswell? (Coop?)
Will there be a Halo (4) Spin Off? // Will there be Halo Wars 2?
Or do we have to wait until Halo 5 comes out? And … will it be on the next generation?