From what I heard, and I could be wrong, that pic is just for the movie and nothing really worth getting too concerned over. I doubt it'll ever cross paths with the series' main storyline.
As far as Alicorn Twilight goes, I wouldn't be able to approve it on a permanent basis. Even tho it's been established Twilight's character won't be subject to any changes, I'm concerned about what her status as a princess will mean for her relationship with the other members of the mane 6 seeing as the responsibilities that come with being a princess are immense. Also, Twilight becoming a princess would somehow imply she's learned all she could about friendship, which could either open a lot more possibilities for the show or kill it. I'm confident of the former tho as the writers have rarely if ever failed to deliver.
Maybe I don't play games a great deal but I haven't really seen a lot of instances where the gaming industry follows its audience closely. EA certainly has a rep for doing whatever it wants, and Ubisoft has been a sour disappointment with Assassin's Creed as well.