We've known about some of these characters appearing for quite a while since they've appeared in previous videos. Of all the characters, Ferb is the biggest surprise as he hasn't appeared in anything else. Not in gameplay vids or concept art. Also cool to see that Doof Inc is a buiding can be brought to the Toy Box.
So we have a lot of horses as mounts now. We now have Maximus from Tangled, the Headless Horseman's horse, Toy Story's Bullseye, Angus from Brave, and Mulan's horse Khan.
Also this pic looks like a Phineas and Ferb dome and textures will be availalble.
And what's that weird tower in the middle? It appears several times and I don't know what it's from