I like the choice, if true.
He's definitely into sci-fi films and the recent Star Trek film (as well as the upcoming sequel) were---and look to be---very entertaining. He's certainly not the greatest director, but I don't think he needs to be. As long as they have a solid script/plot, good cast, and effective on-screen chemistry, the new film should be a good one. The director, in my opinion, is rendered almost meaningless without those three things.
Looking forward to what JJ brings to the table!