Wyrdness on 10 June 2017
I think it's true tbh SMO in November is their main big release of that quarter and the holidays plus the Zelda DLC is out then as well, it's possible XC2 was likely planned for a December release but may have been moved to February for scheduling reasons to have a big game out in 2018 Q1 while also giving XC2 more of a chance and exposure rather than getting buried under SMO and other holiday titles.
