The 5D3 will not be above $3k.
The 1Dx is a pro only tool, so it's priced accordingly. But the 5d3 will be pros/semi-pros who buy it. What happen since the 5d2 was planned and came out. The economy crashed and still hasn't recovered.
Curiously, the 5D2 was announced in September of 2008, right in the middle of the first big recent crash. Up until a few months ago, its price was steady at around $2599. Thus it could be said that the status of the economy had little to no impact on the ability of Canon to sell the 5D2.
The 5d3 will be right around $2500-2750.
I'm holding out for Canon to break the $2000 price barrier with the MSRP of the 5D3.
Recall that in other comments on this website that someone from Canon said that their biggest problem in engineering was bringing in all of the requisite features at the correct price point.
So ask yourselves, what price point would Canon be designing the 5D3 for? $3000? $2500? $2000?
The Sony Alpha 900 was the first full-frame camera to be sold at under $2000 but didn't really take off. With all of the excitement around the NEX and latest A65/A77, it is going to be a completely different story for the A9X and I can't see why Sony would price it higher. Sony wants to disrupt the stranglehold on the FF DSLR market that Canon/Nikon have and the best way for them to do that is with good quality, compelling features and a very attractive price. If Sony's latest announcements are anything to go by then Sony will deliver on all three fronts. We can pretty much forget about there being new compelling features in a 5D3 because that just isn't how Canon do camera design. So what's left? Quality & price. Consider that the 24MP APS-C sensor from Sony is delivering excellent IQ for the NEX-7. Given that the FF sensor for the A9X is going to have bigger pixels than that, it stands to reason that the A9X will have IQ that is at least as good as the NEX-7, if not better. So if Canon are insistent on delivering an 18MP 5D3, expect it to be the cheapest (or close to) FF DSLR announced in 2012 and for the feature set in it designed to deliver that price.