This is the Monster High Toralei Stripe doll, previewed by Mattel toys at the 2011 International Comic-Con in San Diego California.
In the Monster High series, Toralei Stripe is the daughter of the Werecat, and her pets name is Sweet Fang. Apparently she is not a nice doll.
The doll will be available in stores late December 2011.
Watch the preview video here: http://youtu.be/G1lm5IytYg8