The action in Far Cry 4 is believed to take place in the Himalayas. It might be released at the beginning of 2015 according to a report on Eurogamer. Also according to Eurogamer there will be some various environments and you’ll have the possibility to ride elephants.
Also Far Cry 4 is going to be shown at Ubisoft’s annual E3 press conference in June and it will be released on PC, PlayStation 4 and Xbox One.
Far Cry 4 is known to be in development since October 2013 and in January the title has been mentioned in Ubisoft Shanghai CV.