Chevy (well GM) has a 4500 model Express cutaway chassis. The advantage of that is that it has a smaller doghouse compared to the Ford... but it moves the engine out more, so the vehicle is about a foot longer. I don't see many motorhomes on this chassis except the smaller ones, but since Ford is going to phase out the Econoline chassis soon, it might be a chassis that will be the mainstay for the larger "C" models.
Of course, Chevy offerings tend to not change much from year to year, so there tends not to be surprises introduced in a new model year for the most part.