Does the new Dragon Ball Super opening proves that Gohan is going to recover his mystic form? In the new Dragon Ball Super opening (you can see it here https://www.youtube.com/watch?v=FN57gmQlmLU) 

it's seen Gohan raising his ki in base form and sparking electricity. Is this proof that he recovered his mystic form or can a saiyan or any other race (human, namekian, etc) spark electricity when raising his ki in base form?
I think it indeed is a form that he is coming up with. It may not be a proof of he getting back to his Mystique form, however it sure looks similar to what happened before Goku and Vegeta went Blue for the first time. 

I have personally watched that part of the opening quite a few times. Mystique or now, but it sure is a new form.