If the English names of the worlds haven't been confirmed yet, here they are, straight from the final game's script which is in the demo:
Messing around in the Menu!
Jumping around Jibberish Jungle!
Trekking through the Ticklish Temples!
Digging the Desert of Dijiridoos!
Grooving through Grumbling Grottos!
Chowing down in Gourmand Land!
Lapping up Luscious Lakes!
Swimming in the Sea of Serendipity!
Exploring the depths of Angsty Abyss!
Chanting mantras on Mystical Pique!
Taking on the tempest in Moody Clouds!
Living it up with the Livid Dead!
Soaking up stories in the Snoring Tree...
I also have all of the level names for RayWiki if you want, but I guess that's a major spoiler for some.
For some reason, I found the line "Quit drooling on me!" several times. How nice of them to reference me.
VERY SMALL SPOILER AHEAD!!!:
Tarayzan! Ray's cuz from way back...whenever! Glad to see you didn't lose your leopard skin this time round..
Also, I can say that it's not "Holy Polokus!" from now on, but "Hokus Polokus!"
And the last thing... there is a beautiful line that's basically saying there will be more Rayman games.
Yes, I read part of the script (I have the whole one but I didn't want to spoil much), and I have to say it got me excited.

So much fanservice!
(I didn't post any major spoiler I read -
I now know the truth about the spoiler we've been discussing. Some of us may have been close to the truth, but nobody has nailed it yet. )