@Ice_Cap the image is posted wasn't exactly a concept, just FYI. It was an unused proposed uniform set made by a designer working directly for the NHL. Can be found in the "Unused Logo and Uinforms" thread.
Omaha has added a new red cap this season. It's listed as an alternate option to the regular black cap. As far as I can tell the Mavs only have two jerseys this season; the cream homes shown below and the black jerseys from previous seasons.