The CEO has specifically said that he wants to convert all Take-Two games (of which 2K is owned by) into subscription models.
This was driven by the seemingly "easy" profits from the GTAV Online marketplace, and also why Grand Theft Auto V has also gone free, with bi-yearly "big crimes" that players can buy into.
Same is true of XCOM, which they also own and has been releasing yearly DLC for.
I find this sort of thing a bit short-sighted because although I loved all three of these games, I still get bored of the same mechanics and would rather dive into something new.
If they're putting DLC deployment ahead of fresh IP development (which they seem to be), then I guess that's why I sold my TTWO shares yesterday.