I have to finally decide - do I get the Pentax 645D now, or wait for an unknown unannounced camera which may or may not be made, and may or may not be suitable for my needs, and may or may not require a whole new set of higher quality lenses than I currently use on the Canon 5D2.
There have been comments from Canon that with the 1DX only being 18 mp, they are in no rush to produce a higher resolution camera, but it may all come down to what Nikon does. If they do produce the rumoured 36 MP camera, this will push Canon to do something similar.
It occurred to me that Canon may well have a 5D3 or equivalent in the wings, with more than one possible sensor, to be switched in shortly before mass production as needed depending on which way Nikon goes.
Manufacturers never put all their cards into one basket - it doesn't make economic sense, they need to have something in hand to justify the next model round the corner.
Adobe have been leading us on with hints of camera movement removal software in the next or next after Photoshop - just the same. Lightroom 3 doesn't have proofing, even though it's in Photoshop, so it isn't about can't, it's about when, and what will it take to persuade us to fork out money for the next iteration of camera or software.
So, what am I going to do?
Go with the Pentax. I have already ordered the used lenses, and a bird in the hand... and if in a year, or two, there are better cameras than the Pentax and I can't sell the used Pentax and lenses for more than $5000 total, well I will still hopefully have some great images that can make large prints without excuses. if the camera pays for itself in that time (in terms of sales of large images), well so much the better.