I will remain neutral until the show airs. What the teaser shows of an actual story is pretty rudimentary, and it's really all about the execution of the plot.
On a lore level, I don't mind particularly that they changed up the sea devil designs, but twice in the same miniseries? I'm talking about the bug-eyed reptilian version we see briefly in the beginning, and of course Gugu Mbatha-Raw as Salt.
It seems a stretch to expect us to believe they're even the same species, unless the former turns out to be a war helmet, like with the Silurians in "The hungry earth". That was another big switch in appearance from classic Who, but that one paid off.
Also, plastering the POC lead in makeup and prosthetics to signify otherness? Ugh, I feel like this is going to be perceived in the future much like we cringe at black and yellowface.