Two words: Absolutely. Adorable.
I added both the Creepy Crate and the Feline Familiar to my collection tonight! Whew, those Tricky Treats were more plentiful than I had previously thought they would be, but it sure was a trip around the world and then some to get enough for the Feline Familiar.
Note: You should be able to gather PLENTY of Tricky Treats from just visiting all the candy buckets. This means you could buy both the Feline Familiar and the Little Wickerman (although the latter is NOT a true vanity pet) well before the in-game event ends.
The Creepy Crate has a lovely habit of eating EVERYTHING. LOL! So far it's eaten critters and even animals that aren't quite bite-sized. I've seen it eat a full grown cow and horse which is pretty impressive considering the size differences!
And as you can see from my screenshot above, the Feline Familiar is indeed the first flying feline (say that 10 times fast :P). If only you could use the broom mounts all year 'round to fly along with this pet. :(
I'm very satisfied with this revamp of the holiday! Not only does it offer pet collectors options for getting a hold of an old time favorite, the Sinister Squashling, there are also two new lovely and awesome pets to obtain. :D
And guess what? I'm done collecting both the new pets so now I can thoroughly enjoy myself at Blizzcon! Hooray! I still plan on logging in to do a few dailies to save up for that Little Wickerman, though. ;)