For the most part, digital cameras have very quickly reached a state where the technology has moved from being quite new to being quite mature in a very short period of time. A mature product does not provide the overwhelming need to upgrade from the previous to the current model because the improvements have become evolutionary, rather than revolutionary.
Many of the "features" that we see really smack of being marketing driven, a tick box that can be checked off as an improvement, rather than actually being of value to most users. I never use the video capabilites of my camera, whereas there is a whole group of DLSR video shooter out there. The recent push to "retro" looks shows that the camera manufacturers are fighting for the buyer's attention and looking to increase profit margins on their products.
I'm hoping for three main improvements, as technology move forward:
1. Smaller, lighter camera bodies - modern "pro" and semi-pro DSLRs are monsterously huge. I hope that minaturization reduces the size and weight, while retaining the larger sensor size;
2. Adaptive optics - high end pro lenses are optically wonderful, but they are huge and heavy. I would love to see a combination of improved optical design and image processing come up with a hybrid approach that provides excellent image quality that is enhanced through signal processing. We can eliminate chromatic abberation and vignetting in PP - lets built that type of technology into the capture engine; adn
3. Simplification - better designed, intuitive menus and smarter design of camera controls to reduce the clutter and proliferation of buttons and knobs on the camera bodies.
Put those revolutionaly innovations into the next generation of camera equipment and I will be front and centre in upgrading. Incremental, evolutionary changes are not going to excite me too much.