I think if Ubisoft will see good adoption from the mobile gamers, it may very well be the push for them to consider porting their game library over to iOS. After all, the mobile market is pretty damn huge.
Hey, I thought Blizzard, Larian and Nightdive would change the gaming landscape on Mac/iPhone for years now. Despite having first-class ports of many titles, the value proposition of most devs porting to Metal still doesn't line up.
This is not the first Ubisoft, or even first Assassin's Creed game to get released on iPhone. I don't see any reason why this time will be different than the others.
