Anyone want the Party Line?
Yes, there will be a full-frame M9. That's from Leica themselves. I spent a modest amount of time with them (a few hours in total) at photokina, talking to a number of people including Dr. Kaufmann.
Now my own speculation, totally unsupported by the Party Line.
I have the impression that they have revised downwards their estimate of when the full-frame will arrive. photokina 2010 might indeed see a prototype, but I woudn't bet on it, and I wouldn't bet on availability in under 3 years; quite possibly, it might be photokina 2012, but with availability shortly afterwards.
We know, though, that Leica can be VERY good at keeping a secret: the AFRIKA project (S2) demonstrates this...
Cheers,
R.