Personalities can be cyclical, no? Perhaps it shouldn't be too surprising that Gohan would return to the nerdiness of his childhood now that he's a married family man.
The forthcoming issue of V JUMP magazine, as relayed by ANN, has revealed a few more details about the new DBZ feature film, F IS FOR RESURRECTION (translation still pending). The captions on the art above stress that Gohan is picking these duds up while pointedly hanging his Great Saiyanman costume away. It's amusing to think he'd have to calm down and get a real job after Goku saved the world in BATTLE OF GODS, but the more likely explanation is that Toriyama wanted a little more variety during the fights, and less dudes in orange gis.
(The even more likely explanation is that he wanted another figurine to sell).
The spot also offers a much clearer look at the film's new villains, Sorbet and Tomago, and reveals a bit of odd reshuffling in the voice cast, as well. Not that that will necessarily matter to English-speaking audiences once the official import comes along. I'm just waiting for the inevitable, awkward translation that makes "Sorbet" sounds more menacing (like how "Beerus." was somehow scarier than "Bills").