I'm psyched about these cameras. There will be tons of comparisons to the Merrills when these bad boys come out, and I think the forums will be in a frenzy (cough, dpreview, cough). I just hope what Sigma claims is true, that they deliver superior image quality.
Though everyone says the lenses are the same, Sigma claims everything has been redesigned, including the lenses. If true, I hope at least the 19mm is better than the previous. The 30mm and 50mm lenses need no improvement.
I'm starting to love this idea of mating a lens perfectly with the sensor, and buying multiple bodies, instead of lenses. Goodbye DSLRs...