Playing the the "buy what is available now, or wait for a future camera with rumored specs" game caused me to wait for years before up dating my 20D. I could have, and probably should have bought the 5DII way back when but waited. Remember what the rumors and speculation on what the 6D would be bring were? Remember when we thought we would have the 6D by? What are you going to do when Canon waits till October to announce the 7DII, then says it won't be available till December then it finally launches and rumors and specks for the 6DII starts swirling around?
Here is my suggestion. Figure out what you are looking for and need in a camera, figure out your budget, then go get it tomorrow. Heck, you might even end up in the Nikon camp, but go get your camera now, and don't look back.