Ubisoft has dated the Yeti DLC for Far Cry 4:

Ubisoft® announced that Valley of the Yetis, new
add-on content for Far Cry 4, will be released on March 10, 2015.

Players step back into the role of Ajay at the moment his helicopter crashes on a
perilous Himalayan ridge. Stranded with no shelter, players must capture a camp and
guard it from a mysterious cult who will return to reclaim their encampment. If
players persevere, they will have more to fear than a stand-off against the cult, as
yetis lurk in the shadows. 

Players can take on Valley of the Yetis in single-player or with a friend in co-op
as they fight to survive in the harsh Himalayan Mountains. While searching for a way
out of the valley, they will unravel the mysteries behind the yetis. 

Valley of the Yetis is available as part of the Far Cry 4 Season Pass or can be
purchased separately. The Season Pass includes Valley of the Yetis as well as The
Syringe, Escape from Durgesh Prison, the Hurk Deluxe Pack and Overrun.

Players can find more information on the Far Cry 4 Season Pass here:
http://far-cry.ubi.com/en-US/buy/index.aspx#tcm152152012-4 

For more information on Far Cry 4, please visit: farcrygame.com and
facebook.com/farcry