If the rumours are to be believed, I think they'll release the campaign first for £20/$25 and next year when the game is finished, they'll offer an 10 year anniversary MP upgrade for another £20/$25 on top. I can't see the most iconic MP game of all time having its main portion neglected. COD is getting trampled on from all angles right now where even mobile games are more popular so they've probably brought the release forward by 18 months in a bit to stay relevant and also get paid off twice in the long run. Even with upkeep costs, they money they can make on supply drops easily outweighs any costs and their spare dedicated server structure can host remastered matches to fill slots of people not playing games that run on the same infrastructure. I think most of MW:R's matches were played on disused Advanced Warfare listen servers.
Should be very interesting to see what happens though and everyone is pretty much in the dark and dumbfounded!