If you actually notice, the only prices that really drop when a new camera is out is second hand price lol. If its first hand aka brandnew, if you look now, a 30D isnt much cheaper then a 40D. Its true that the 30D when launch is more expensive then 40D launch price but due to how the market work, it probably wont make sense just because a new model is out you going to dump the old model to worthless price. Especially in the field of audio visual products where a model 3 year ago can probably still perform very well (300D still takes fantastic pictures comparable with today dslr with a lower pixel count though). The masses in the end are very practical, go for the most affordable solution that your budget can afford. If you had 2k today and given a choice of 40D at 1.8k and say a 30D at 1.2k brand new, I probably will get the 30D lol. The only reason why electronics drop price especially like dslr is due to manufacturing enhancements where there is less defects and thus more output and lower cost cause unlike a microchip like cpu where you can sell it as a lower model if the defect isnt that bad, a defective sensor is a useless sensor.
That said, I probably guess 5D replacement will be slightly higher then the 5D if its a FF with newer tech. Else who will buy the 5D thats left? I highly doubt canon is stopping 5D production anytime soon. You cant sell a better camera at cheaper price can you? Also I believe it wont be much higher. If the price is like 1k difference, most people will just get a 5D instead. Either way audio visual market is a very dangerous market as the quality is usually subjective and that the biggest competitor is usually your own products lol.
Anyway Im just hoping canon will introduce another high quality EFS lens like the 17-55 lol. Camera body wise I look forward to the new consumer line.