We have confirmed that a high megapixel camera is coming from Canon in 2015 and it will be around 50mp. The camera will not be an EOS-1 style body, so don't expect the price to be above $4000.
We have yet to confirm when in 2015 the camera is coming, as the exact date may be unknown to Canon at the time of writing this.
More to come once more is confirmed.
Some of what was in this previous post has been confirmed as far as resolution and body style.