The Mavic Ksyrium Pro Disc Wheelset it, for all intents and purposes, is the same as the Kysrium SLR. Bring that it's disc brake-specific (finally!), there are a few key differences.
First, the brake track -- there's no Exalith treatment because there's no brake track. Additionally, Mavic opted against using the Tracomp carbon fiber spokes on the non-drive side of the rear wheel because of the braking forces exerted on that side in a disc brake application. And, since road bikes are moving right into mountain bike territory for on-the-fly technology changes, Mavic made the front hub with interchangeable end caps to accept 15mm thru-axles. Aside from those differences, they're SLRs. Same super-drilled rim to reduce weight, same QRM+ adjustable bearings, and same surprisingly great tires included.