Alliant Credit Union has come out with a new cashback credit card that offers 3% cash back on all purchases for the first year of card membership and 2.5% after that.

The only other cards I'm aware of that earn the same or a better cashback rate longterm are limited to a small market. They are the:

USAA Limitless Cashback Rewards card, which earns 2.5% (w/no annual fee) on all purchases. See who's eligible to become a USAA member
Marukai Premium JCB Card which earns 3% on all purchases (w/low $15 annual fee).