The rumor sounds pretty credible to me. Canon always want to keep up with Nikon and vice versa and I can't imagine they would give the megapixel crown to Nikon after having it for so long (D3x excluded on price
That 45 megapixel though - if you divide by 1.6^2 you get 17.57MP which is a tad less than 18MP which is what you get on the 7D. Thus the pixel density would be very similar to the 7D - just a bit under. I actually dislike the 7D image quality with a passion as I bought one and shot with plenty of L glass and the noise is horrible even at base ISO100 compared to my 5DMarkII. Other people like the 7D and if you're one of them then I'm happy for you. For me though I'm not touching a camera with that kind of pixel density with a 40-foot pole. If I ever want 40MP I'll buy a Pentax 645D and give those megapixels the space they really need. I don't want to spend my days in Lightroom and Photoshop adjusting the noise reduction sliders (landscape) or using blur tools to soften bokeh areas (portrait).
That 5DMarkIII - wow that is right up my alley! I so so hope it is spec'ed like that and be the cheaper of the two.
61 points AF! I hope they have X-type sensors left and right and they are spread out! please! 5D2 has 9 AF points but I can only rely on one of them - the centre. So it's not the sheer # of AF points - it's the usable ones that count. Give me a grid of say 19 x-type sensors (like the 7D) spread out and I'll be very very happy.
The 6.9 FPS. Wow that will blow me away after being used to 3.9. Sports pros would scoff with their 1Dx's but it's a huge improvement for me.
22MP - ooh yeah I think 18-24MP range is the sweetest range for pixel density in full frame cameras.
I'd happily buy the 1Dx except I don't want to have to lug that portrait grip on my big overnight hikes, so essentially I'm after something smaller and just as rugged.
Things that are missing from this spec sheet is WEATHER SEALING. I'd be p1ssed if the 5Dx gets all the shoot-all-day-in-the-rain weather sealing and the 5DIII doesn't. I hope Canon seal them both right up. I'd happily pay and extra $500 or more for decent weather sealing!