Vincent Goodwill of The Detroit News confirmed that the Pistons will indeed hire Roy Rogers and Dee Brown as assistant coaches:
"Former NBA players Dee Brown and Roy Rogers will sit to Frank’s side whenever next season starts, a source confirmed to The Detroit News."
Both have been rumored to be frontrunners for a while now and, other than having experience playing in the league, I think both have obvious roles with the team. Brown will most likely tutor the young guards, particularly Brandon Knight, and Rogers, who was a big man coach as a Celtics assistant, will most likely focus his immediate efforts on working with Greg Monroe.
Goodwill doesn’t say how many assistants the Pistons will have next season, but he did report that incumbent assistant coaches Brian Hill and Pat Sullivan are still in the running for spots on Lawrence Frank‘s staff.