Following the official reveal of call of Duty: Infinite Warfare, the Modern Warfare remaster was detailed. The game, which will be available alongside Infinite Warfare, will feature the full campaign, as well as 10 multiplayer maps.
In addition to the information drop, Activision revealed three Special Editions for Infinite Warfare and detailed that each of the Special Editions would include Modern Warfare Remastered. The cheapest of the three editions is priced at $80.
Some gamers vowed to wait for Modern Warfare Remastered to go on sale as a standalone game, instead of paying $80 for the remaster plus the new game (which apparently they don't want). Unfortunately for them, Modern Warfare Remastered will not make a standalone purchase.
According Activision's support page, "you must own Call of Duty: Infinite Warfare in order to get Call of Duty: Modern Warfare Remastered."
It should also be noted that progress from the original Modern Warfare will not carry over into the remaster.