I got an email from Ebates today, and after searching Twitter I found FatWallet is participating also. As far as I can tell, the end date has not been announced.

Edit: Aug 1, 2012: The categories have changed, so be sure to check what each site is currently offering before you purchase.

Ebates cashback in the following depts:
as of 12/02/12
Handbags 4.0%
Women's Shoes 4.0%
Kids' Clothing 4.0%
Juniors' Clothing 4.0%
Baby Clothing 4.0%
Beauty 4.0%
Personal Care Appliances 4.0%
MYHABIT 4.0%
MP3 Store 3.0%

FatWallet cashback in the following depts:
as of 12/03/12
Juniors' Clothing 4%
Kids' Clothing 4%
Baby Clothing 4%
Boys' Shoes 4%
Girls' Shoes 4%
Luggage 4%