Ubi Service Outage Compensation
Ubisoft seem to be compensating players for the outage to their sadface-inducing "always on" DRM service, which rendered some folk unable to play Assassin's Creed 2 and Silent Hunter V for periods of time since release. Apparently Silent Hunter V players have been offered Shaun White Snowboarding or Prince of Persia as a digital download in an email which was sent out over the last couple of days. Evidence of Assassin's Creed 2 compensation here, via BluesNews.
I'm guessing the free games don't have always-on DRM included.