Definitely will get WD later on when it is cheaper. I was really excited for it, but I recently finished AC IV and while it is a very good game, for me as a completionist it was just horrific to finish it 100%. Afterwards there is the multiplayer which IMHO is just mediocre and crammed full of stuff, too. Characters, perks, styles, stuff to read etc. I mean all this collectibles, sidequests and stuff to do in the world is just over-the-top. While I basically praise additional content in this case it didn't add any worthy to the game. It got just longer and bored the crap out of me. Freedom Cry was just awesome, had the right play time and felt like a real addition to the game. In fact I loved it more than the main game.
Same goes for Rayman Legends with the achievement which requires you to get from awesome level 10 to 11, which takes over 11 weeks if you manage to get a gold trophy in the everyday challenges.
Ubi said WD's story will take ~30hrs and all the additional stuff up to 70hrs. No way I'm gonna play this anytime soon.
IMHO it seems that Ubi tries to force players to play their games as long as possible to avoid that players will sell their games after finishing the story. I'm basically fine with this, but not if it is just for content's sake, but no fun at all or at best mediocre.