The Wolf Pack is back for PayDay 2 and if you purchased the DLC for PayDay: The Heist, it's free.
The DLC contains the Undercover and Counterfeit heists, and if it's anything like the DLC for the first game, new weapons and Trophies will be made available as well.
More information on the content is available through the official PayDay 2 website.
Those who don't own PayDay: The Heist or the Wolf Pack DLC can pick it up for $6.99 on Steam.
If you are interested in purchasing PayDay 2, it's 75% off through the Steam Lunar Sale. The standard game is usually $19.99, but you'll only play $4.99 for it through February 12.
The GOTY Edition is also 75% off at $12.49 instead of $49.99. All DLC is 75% off as well, save for four DLC options which run 10-45% off.