I'd like to say that this is a spin off, and it will likely not affect the primary show itself. Therefore, there is no chance of it ruining anything if it is bad.
I really do hope that those human images are either very rough concepts or completely fake. They looks absolutely horrid. Nope nope nope.
I'd probably be okay if the humans looked really nice, I've seen good humanized ponies before, and they can look alright. Having the skin match the coat, though is just odd. It makes them look more like aliens.
I'm going to wait until some new developments come into light, but if those are the final designs, I have very low expectations for it. Because it comes in Spring, we won't have to wait long to find out more.
Still, I think that it may be possible to be a good show, so long as the designs aren't that. I'll wait and see.
And, of course, I will watch it no matter what.