Leica would have to field a MF competitor that would blow my eyeballs to the back of my scull before I'd invest with them ... and the PassPort warranty would have to be at least 5 years. IMO, when some of the digital back makers dropped prices, it stymied any further aspirations to invade the pro MF market.
A R10 FF DSLR at a decent price that was made by Panosonic would be fine ... as a personal indulgence ... if the economy makes a come-back.
A M9? Maybe ... after it's been in market for 2 years and proved itself. I'm not going through all that again, trust me.
I personally don't care what Canon does or doesn't do. Nikon nailed my DSLR needs to a T with the D3 and D700. A revamped 85/1.4 with Nano coating and AFS shouldn't be to hard ... and VR would be nice. A 35/1.4 AFS would be dandy also. Personally, that's all I need in AF Nikon Primes ... Zeiss ZF fulfills everything else in the "marginal need" catagory.
Sony is the sleeper in all this. If they nail the Pro spec FF camera and update the Prosumer version to full frame ... AND Zeiss delivers the rumored AF35/1.4 and/or delivers an AF version of the 28/2 (or legendary 21/2.8) ... they will be a serious contender. The 24-70/2.8, 85/1.4 and 135/1.8 are already spectacular performers, and build quality is top of the heap. Sony has the juice to just about anything it puts its mind to.