They are similar, but aside from open window work wrapping around the body (something more and more common with recent concept vehicles), and them both being white in color, their similarities kind of end there.
Robin.
Both the 8C, and the MiTo take a few small ques from the current design language, and run with it wildly different directions. If a new/redesign 8C surfaces, and this car represents the non-supercar/compact vehicles in the lineup, then you wouldn't have anything to worry about. Just conjecture, on my part however. I don't know what direction Alfa will go in, in the years to come.