It's his show and it's different from the -blam!-ing movie what other proof do you need
http://www.dorkly.com/post/75051/everything-you-need-to-know-about-dragon-ball-super
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That is not a official source. Plus it says that Resurection of F will still probably matter. Seeing as the last movie (Battle of Gods) is canon (given it was made by Akira) I see no reason the sequel would not be canon.