So now, we are seeing incremental changes. The main reason for a new model is that first time buyers want the latest and greatest, and those with 3 or 4 year old cameras are looking for something newer.
Sensors are very close to their maximum efficiency, even incremental improvements get expensive. This means that new models will add software features and faster processors with bigger batteries. It doesn't matter who the manufacturer is, if you want to compete price wise, you are limited in what you can do.
Sony's successes have come from miniaturizing products, thats their legacy. Its good that they are sticking to it, because there is a market for smaller products.
Canon's legacy is producing products that are not necessarily the highest technology, but which give the most value for $ spent. Its also a successful strategy, and when combined with supurb customer service and reliability, they are increasing market share. They are very good at making every part of a design earn its cost. They hold back on new features and hardware until the cost or customer demand forces a change.
The two different philosophy's - A miniature hard to repair throw-away product (because its cheaper to replace than repair) versus a conservative and repairable one are the distinguishing things and both seem to work for the respective buyers.