I find it very humorous that the last season had general ironwood flee the city as if it was completely lost, the combined military might of Atlas was completely laughed off by the first wave of Grimm, hundreds or thousands of truck sized monsters that can smash through buildings rampaging through the streets, completely unchecked by any kind of police force...
And *then* a much bigger wave of Grimm arrives, a giant city destroying whale monster and invincible wizard god at the front, after the rest of the military completely gives up.
And what do we see on the trailers. The kids goofing around, joking, playing with gadgets, having a great time.