Two got sacked , the two bosses of Infinity Ward and then most of the core developers left over a dispute over bonuses or to join there old bosses at Respawn.
Hence why Sledgehammer and Beachhead are involved as Infinity Ward don't have the skill set to produce the game , its just a name now and nothing else as the people who made Infinity Ward special don't work at Infinity Ward .
Im just not getting sucked in by the hype machine as i have already said " this installment of COD has the potential to be the worst since COD3 " i do hope im wrong as im a codite and look forward to my yearly installment but from where im sitting ( on my fence ) im not as optimistic as your self and others.
But then again i have been stung by the hype machine once to often, Duke Nukem being the final straw of a couple of years of mainly over hyped games , with very few actually delivering on the core values i expect from my purchases .
Co Op survival has been done before and was indeed part of MW2 but once completed i never revisited it , if its like MW2 co op survival , i will be disappointed , have to say Combat training in Black Ops was better than what was offered in MW2 and combat training was the right direction to go , to make the game more accessible to noobs .
that might sound a bit harsh but that's where i am at the moment , to much hype , not enough substance .
With TalkTalk , not as bad as some might have you believe