No, Xbox One does not have Army of Two.
The first Army of Two was released in 2009 and is not backwards compatible with the second game.
Yes, Army of Two is still playable. However, it may not be as polished as it once was.
Army of Two is available on PC, PlayStation 3, Xbox 360 and Wii.
Yes, Army of two online co-op is still working.
Yes, Army of 2 is available on Steam.
Yes, you can play Army of Two on PS5. The game is available as a digital download and also comes with a physical copy.
There is no confirmation or denial of a remaster at this time.
Army of Two 40th Day is not currently available on PlayStation 4.
The army of two games was discontinued in May of 2018.