I have noticed over the past year or so while driving along I-96 and I-275 that they have been replaceing all the old cameras, including the towers, and electronic message boards with new ones. The new cameras appear to be "dome" style instead of the old rectangular pan & tilt models.
Don't know if they are intentionally keeping them off the MDOT web site or if they haven't added them to the site yet. I do know that these new cameras are working because (listening to the scanner) I hear the MSP dispatchers tell responding Troopers something like, "Units responding to the accident on 275, i see it on camera; it's on the left sholder south of 7 Mile".