The Elder Scrolls V: Skyrim Special Edition
Path of Exile
3 days 16 hours
32 days 19 hours
Call of Duty: Modern Warfare 3 - Multiplayer
28 days 3 hours
Call of Duty®: Modern Warfare® 2
13 days 1 hour
Counter-Strike: Global Offensive
12 days 13 hours
The new content I mentioned in the second and third paragraphs is all free. That free content has been rolling out gradually since November 21, and the last bit (a new difficulty mode) will come out on Monday, December 12.
The final paragraph mentions the paid expansion pass, which includes two tribes and two upcoming story expansions (those will come out next year).
I mention the new difficulty mode in the third paragraph, where I say "There’s also a new ‘Brutal’ difficulty level, which offers no last chances [...] available from December 12."