I don't think there's any topic that's producing more anticipation in the world of gear than the upcoming Canon and Nikon mirrorless cameras. And that anticipation is only going to heat up more with this news about Canon's upcoming cameras (yes, plural).
Canon Rumors is reporting that Canon is readying two full-frame mirrorless cameras for release in the first half of 2019, with one of the models being the top-of-the-line body in the new series. That model is supposed to be carrying a 30.4-megapixel sensor; the 5D Mark IV carries a sensor with that exact resolution, so there's a good possibility that this is the same sensor or a modified version of it. It's also being reported that both cameras will have 4K, though there's no information on things like crop factor yet. There's still no definitive news on the crucial question of the lens mount, though Canon Rumors has heard of a few different possibilities, which you can read about in the full article on their site. Either way, with Sony continuing to push ahead with excellent cameras at aggressive price points, it'll be very interesting to see how Canon and Nikon respond, and in particular, if they'll be able to leverage their massive lens lineups effectively.