As part of the 30th Anniversary Celebrations for Ubisoft. Next free game confirmed at Game Skinny is Far Cry 3 Blood Dragon.
Haven't played this one yet so keen to find out what others think of it. Played the first one back in the day but not the sequels.
It is a standalone game and does not require Far Cry 3.
As per jimboaus comment below starts November 9th and Kotaku mentions this as well. Minus for me but plus that it is even sooner!
Very fun game, worth a play (especially for free). Has that 80s action film vibe.