Do you kinda feel they already spoiled a lot of the good Misty scenes in the preview? I mean I know we'll obviously get more stuff, but it seems like all the big Misty scenes like her introduction, the hearts image, her running from Caterpie, etc. were taken from the first ep and shown already, so it won't feel "new" when we see them in the ep. I think Misty's best moments will come in her battle in the second ep, but I'm not sure how many more memorable scenes she'll have in the first.
Let’s just wait for the episodes and see? I’d expect two 20 minutes long episodes to include a bit more stuff than like 2 collective minutes of previews, even if the screentime is going to be shared between many characters. Personally I really don’t mind being spoiled stuff unless it’s really some M. Night Shyamalan twist or something, I often even go through the episodes screencaps on filb.de right before watching to decide if it’s going to be interesting lol.