Despite any quality control issues with the D800, it still poses a MASSIVE problem for Canon.
Canon's marketing AND tech departments must be sweating bullets, unless something big is on the way.
Lol. Really?!? So, you've seen the sales figures? By what margin is the D800 outselling the 5DIII? Please...share all of your hard evidence.
In fact, I have yet to see anything even remotely convincing that anyone outside of the few but very vocal minority of DR-obsessed posters on forums like this even give a crap about this 'massive problem'. As I've pointed out elsewhere, from 2007 to 2010, Nikon soundly beat Canon for sensor DR and ISO performance, and during the same period, Canon gained market share while Nikon lost over 10% of the market. So...it seems like Nikon has the 'massive problem' - and the fact that the D800 has 36 MP, with no meaningful boost in DR over the predecessor, and a reduction in high ISO performance, is a good indication that Nikon realized they were coming out the losers, and are now trying Canon's 'more MP are better' approach.
Regardless, you're assertions are clearly unfounded, and I suspect at this time next year, the sales figures will show that Canon is still #1 in dSLR sales, as they have been for the past several years (despite their 'massive' yet somehow nonexistent 'problem'). It's ok, though - most likely by then you and the rest of the minority will have tired of bashing the 5DIII's DR on Internet forums. I sincerely hope you'll be out taking pictures with some camera - even if it's not the 5DIII that most of this DR-bashing minority never had any intention of buying. But realistically, I bet you'll still be here, bashing the DR or ISO noise or some other perceived 'problem' with the 1D X, T4i/650D, or whatever. Whine on........