I think it's interesting and heartening that Sigma continue to manufacture and expand this range.
I can't imagine it adds very much to their sales or profit, yet they show commitment to the line - good for them; development in action
When these might appear and how much they'll cost is anybody's guess, of course
Should be under 1000$ considering SD1 dropped to match Nik D800, Fuji X-Pro1 2500$
Just how good are these new lenses? The old DP lenses were amazing, but can the new ones not only live up to that, but surpass them? The 15mp Foveon sensor is going to need really amazing glass to shine and it's not like you can just put on a better lens later.
Should be top end. They already launched these two for Sony NEX line on 24MP sensor. So 15MP should be perfectly fine.
And how fast is it going to focus? The new m43 cameras are spoiling people rotten, I wonder if Sigma is going to get anywhere near that.
AF should have improved (a hope) as its less affected by the bigger file sizes, and C-AF will be getting some improvement from faster dual processors, also the new lens designs, but am not seeing it as fast as m43 or nik CX phase detect.
These are huge RAW files, are we going to be stuck with the same 3 frame buffer, and how long will it take to clear it?
Operation speed will be the biggest issue, as from Luminous Landscape review on SD1 it was real frustration, so same will hold true for these little monstors. But again, cant complain Sigma for this, specially when some bigger DSLRs like Sony A900 was also affected badly by large 24MP file sizes. This one got much more complexities to handle, due to its unique 45MP output in 15MP consolidated images.
But all in all, if you are not into fast action, portrait, sports, candid, fashion or any kind of photography that needs burst mode, AF tracking and performance, then these are some unique offerings to complement a m43 or a heavy full frame DSLR users, as a backup camera to capture well thought shots of colorful landscape, waterfalls, artistic portraits or architecture etc.