Besides some gore I don't think we've had till now. It's true to the original vibe. The CG animation was actually true to the original style of mixing animation methods within the story. Don't know why anyone would be surprised or dislike it. One of FLCL's best known traits is the illogical mixing of styles. This is merely the natural progression of that. Maybe one day an episode's action scene might break out into a mind melting 'claymation' fight scene, which wud be badass, it's FLCL expect it to be wild. We get to see Haruka up to no good, in a few different disguises along the way, lookin for Atomsk. Obviously with no regard for anyone else's safety. Up rooting the lives of others and civilian casualties with her antics is part of her M. O. But this time around, heads will roll for real. As she snakes her way into a leadership role of a yakuza style gang.
It's actually a good bit of story packed into 3 episodes, especially when considering they still managed to give some backstory to the motivations of the 3 new main characters. It fits well into franchise's long plot. Give it a watch along the way thru the series. It's short anyways, 3 enjoyable episodes. I personally recommend watching all of FLCL in chronological order instead of release order. It will make more sense that way. Especially with shoegaze coming next week. Not that FLCL should ever truly make sense, that's the point I guess.