Marvel is making a smart business decision by letting Taika Waititi do another Thor movie. Personally, I do not care for Waititi or his style. But Thor: Ragnarok was a big hit at the box office, making over a $100 million more than the previous film. So even though he is not to my particular tastes, I respect that Marvel is going back to Waititi well.
And to be fair, the movie looks like it could be a good deal of fun, at least from this trailer. Giving the Guardians such a prominent role (at least in the trailer) was also a good idea, as their franchise is probably the most tonally in line with Waititi. I especially enjoyed Thor's cap while he is doing his workout. This movie, like Ragnarok, looks to essentially be a comedy with some action elements sprinkled throughout.
The introduction of the female Thor is very intersting. The story from the comic was actually very tragic, dramatic, and compelling. I don't know that Waititi will be capable of matching that tone. But I am excited to see how they will handle this story. If they do manage right, it could have a lot of potential.