The New Domino's Pizza Logo above, the old below. Not much of a difference really, it's basically the same logo minus the text.
In the U.S., when the text does still appear in the new logo, the "Domino's Pizza" will be replaced with "Domino's" only. Russell Weiner (Domino's chief marketing officer) said that "so much of our menu is beyond pizza right now that we feel like we're more than just a pizza place."
Domino's ad agency is MDC Partners, CP&B.