Infinity Ward Studios confirmed a few days ago that Call of Duty: Modern Warfare 2 will have a hardcore mode with the launch of Season 2. It seems that this is not the only surprise that the developers have prepared for the players.
In response to a comment from a player on Twitter about the Infection mode in Call of Duty: Modern Warfare 2, Infinity Ward explicitly hinted that it will appear in the game as early as February 15, that is, with the start of the next season.
Probably as early as next week, we can expect the Call of Duty developers to share the details of the Infection mode for Call of Duty: Modern Warfare 2.