Yes, the PQS has a max shutter speed of 1/1000 sec. They are indeed the later iterations of the lenses though I doubt containing any changes in the optical formula but rather, more durable materials for the shutter blades to endure the faster speeds. In the Schneider lenses, the blades in the PQS lenses were made of carbon fibre.
The Rollei 6008 is an unsung marvel of MF, receiving scant attention from purists because of its reliance on batteries and electronics. The upside of this is that the cameras and lenses can still be had for reasonable sums considering the capabilities of the kit. I recently bought a virtually unused 6008 Integral 2 (with rebuilt batteries) and a Schneider 60/3.5 for $1500 and recently, a pristine Schneider Kreuznach 150 Xenar PQS for another $900. A clean but meterless 500 CM with a dismally dark focus screen and an 80 Zeiss pushes $2k nowadays.