Carwow released an exclusive rendering of what they anticipate the C Pace to look like. They seem to think that it will be slightly smaller than the F Pace, and will have a more sporty sloping roofline. Here's the side by side comparison.
I do think that they will change more than just the roofline, and I hope that we see more styling cues borrowed from the new E Pace. Alike most automakers these days, it seems that Jaguar will be doubling down on their SUV offerings.