I was on Fandango where you can already buy tickets for Thor: Ragnarok, and the length of the film there is stated as 2 hours 10 minutes (see my screen capture attached). That would seem to contradict the much shorter running time released earlier.
Also, this Taika Waititi interview with Screen Rant might alleviate some concerns with the third film and the Hulk upstaging Thor. He states, "Personally I feel like... if the movie’s called Thor, then Thor should be the best character."
I am still disgusted that Jason Ass-clowns cutting of Thor's hair has permeated the MCU. They FINALLY got Thor's look right in Avengers, Dark World, and AoU; but he comes Aaron's blonde Hercules look to screw it all up. And for those who were bitching about the whole lack of his helmet, well you got it, but NOT the one you wanted. I personally would rather he still had his hair, the one feature that makes him stand out from all the short haired heroes.