For Photokina in September Leica is rumored to announce new line of M cinema lenses (with cine housing/gears). The first set of lenses will be all Summilux versions (f/1.4). Based on this rumor we can speculate that the next M camera will have some serious video upgrades. Expect to see more video workshops offered by Leica Akademie.
Leica already has a professional line of cinema C lenses (Summilux-C and Summicron-C).