From the description:

"Lulu, the Fae Sorceress and her signature polymorph ability"

Says Fae, not Yordle. Sorry, I need a direct confirmation from a Riot to confirm she is in fact a yordle. Lots of people thought Fizz was a yordle too when he was first introduced. It just seems odd to make another Yordle so close after Ziggs.

-Miles McStyles, Yordle Enthusiast Summoner

Lulu? That's the name we call Garen behind his back.

~Talon

Edit: I think I was just downvoted by a Red...

She's a yordle.

I am inherently suspicious of anyone claiming to be a "yordle enthusiast."

Yordle support? Check.

omg omg a yordle!!! I want a refund on pantheon right now so I can insta buy her!!!!