I came across the Canon Rumours page by accident as last year I was looking to purchase a 600d and was trying to read reviews about it and found out there may be a new model out early in the new year (2012)...
I understand your concerns, but it's not only about camera's possibilities and you'd better think in advance what your potential needs are and what specific brand can offer you.
As for me, I won't look at other brands, because I like the feel and look of the images I get out of my camera. Especially for skin tones.
One of other important things is feeling comfortable with your tools and it's not only about the camera, but also lenses collection (take into account focal length, maximum aperture, focusing), flashes, accessories, etc. So it's time for you to think whether one brand can offer you what the other one can't, because you choose a whole system, not only the camera body now.