Upload & Sell: Off
Few things to keep in mind.
1. The kind or high iso improvements which we had seen in the early upgrades simply cannot be duplicated. The current designs are nearing their quantum efficiency limits. a half stop improvement in S/N is a huge improvement, and not many people would even notice it.
2. For all our complaints about canon Sensor, where it is behind sony is in base ISO DR. If they can improve that by one stop, then there is really not much separating the sensors. Canon sensors actually have better DR usually pass iso 800.
As far as the sensor part of equation goes, we are dealing with a much more mature product that what was available 10, or even 5 years ago. As such, improvements will be in other areas, autofocus, hopefully the contrast detect autofocus (that would be huge actually for many people) FPS and write speed, additional bells and whistles (touch screen, wifi, etc). For some these would be worth the upgrade. for people new to photography, they are getting a lot of nice stuff. for most, the improvements are only incremental, and if we did not have such a strong consumerism mentality, we could skip a generation or two, and use our cameras for 5-6 years, instead of 2-3 years. In the olden days of film, people had the same camera for 10+ years. It was a good thing.