When I bought my X-Pro1 it felt like a "new camera", not just "another camera" in the collection, and I think that the size is the reason for this. I had a few mirrorless (Olympus E-P1, Canon EOS M, Fuji X-E1), but none of them felt like a DSLR replacement, until the X-Pro1 came along. I would love it if the X-Pro2 was roughly the same size, to keep a nice balance to the bigger lenses.