Ubisoft has been giving away a game for free to all who claim it, once per month. If you do, then it is yours forever. If not, then you missed it. The most recent entry is FarCry 3: Blood Dragon, which is a standalone spin-off of the Einstein-quoting island shooter that parodies 80s action content. These games will be delivered by their UPlay digital distribution platform, and you require an Ubisoft account to claim it, but that's your choice to make for free content.
We're almost at the end of Ubisoft's 30th anniversary promotion, with just a single title left. I'm not sure what it is, but I'm guessing it has some significance to the company and, like the announcement of a sequel to Beyond Good and Evil, could be accompanied by larger news.