I sort of hoped that this series would explain why Klingons look like they do, and with Ash Tyler aka Voq's controversial relationship with himself and other klingons, it was promising... to quote Worf "it's a long story".
I was just thinking about that myself. The klingons seemd to jump from "bald" to an aproximation of next generation style and just ignored the descrepency with the original series style, when they got most other details to sync up. Perhaps they just ran out of space for that in the script? Or perhaps that being left for the section 31 spinoff if it happens...