Ok here is my developement plan and franchise handling.
There will be one big maingame it will release with campaign, firefight and spartan ops.
Campaign theater is also included.
Additional it gives you a free voucher to two download games ( Halo live Arena and Halo creator) both are also seperately aviable for 10 $
Halo live Arena
This is a standalone multiplayer game, 60 fps, dedicated servers and full blown custom options, base gameplay is arena shooter
Btb modes possible for servers.
Theater aviable much improved.
The game is fully supported and advertised for years.( info on this below)
Halo creator is a full blown map creator and modder
It is also fully supported and advertised for years.
More Maintitles are just like the above described campaign game but they will include map,skin, assets and weapon packs for Halo live arena and Creator
These updates are also seperately aviable for the standalone games.
Think of big patches coming to the year long supported everytime a main title comes out.
Edit: sorry for bad english and spelling on phone and german