ok, so this is going to sound silly, but I thought polly got her hair cut during the story. Like I read a thing about how Anneke Wills got her hair cut short to spite the production, because she was annoyed they weren't keeping Michael Craze on, so they had to write a bit where she gets a makeover into the story, and gave her extensions for the start of part 1. But that picture has them all in the tardis and she's got short hair. I guess that picture could be the end of the story, idk, do they have a tardis scene at the end? If they have her just with short hair all the way through and no explanation it's really going to bug me, I kind of wish I didn't know that random backstory now.
Apart from that bit of me being ridiculously pedantic it looks like it'll be good, though, I like these animated releases they've been doing, I think I have all of them so far, they're fun.