Man, I was annoyed when the T4i came out just after I had bought a T3i. A mere pittance compared what those who just bought a full frame camera must feel. This is just the nature of technology, and epescially a company like Canon. Something better is always around the corner.
First of all, the sensor is only part of a prototype at the moment. So, relax and save your pennies. It will be a while yet. I have to say though, after seeing the video, it looks so tantalizing I can darn near taste it! I’m going to use incense exclusively for my lighting when I finally get my hands on one.