Lots of little girls are animal mad - I was one of those way back when - and Disney have specifically tapped into that with the Palace Pet line and looked to lock in success by tying them to their classic Princesses. Walk through the Disney Store and you'll see a lot of their dolls now come with their respective (glitter-mauled) pets. Their sudden heavy appearance in LEGO isn't that surprising... They're LEGO's target audience, not us. Although I too am a little disappointed that the only 'proper' Princess sets are just the two and both exclusively Frozen-themed... (From 6, to 4, to theoretically '2'? Ouch!)
Some of these may well look better in person though, sometimes I find the promo shots don't always do (some) sets any favours... On the other hand, 'Treasure' (Ariel's Cat) is notoriously difficult to make look good as a toy - Build a Bear produced a version with this long brush-able side fringe that made the poor cat look like a certain dictator... I get the sense mine (because who am I kidding,I will buy all of these sets) will end up disappearing off to hang out with some of those Nexo Knight bad guys at the end of the day.
Look at it on the plus side for us AFOLs, new animal moulds! The head-gear all looks detachable, so having Windflower certainly looks positive for a future Meeko (and Pocahontas) appearance. The bright colours of the new critters that we have will nicely populate out the expanding Elves' fantasy forest... I certainly will be tracking down extra Windflowers if her tail is as sweetly done as her face.
If they sell well, LEGO may well knock out a few more Pets.. So perhaps a lilac panda (Mulan), peacock, elephant, lynx, pink skunk, new tiger mould... The vegetation around my various Castles look pretty barren of life since those Friends Animals Packs bit the dust, so expansions in beasties (even in fantastical colours) is VERY welcome from this fan!
... Although Treasure is pretty bad, it has to be said.