Arcade Fire can do whatever they want. They're amazing enough that even if they released 50 different album covers, it wouldn't be pretentious at all.
I never said they weren't good or amazing. I said it was pretentious. It's them showing off that they can do what they feel like. There is no reason to have eight different album covers unless you are doing different album covers for different types of releases (i.e. digital, vinyl, cd, etc). That said, The Suburbs is a great song.