Well I was warned that no one would believe it was a mistake - conspiracy theorists and all - but seriously, that's all there is to it. Art asked me to type up a thank you for the canon rep bringing out stuff for students to borrow, there were "new" 100 macro IS lenses, the new(er) 70-200 lenses and I just made a flat out mistake. Both with the word "new" and the "s" designation on the Mark IV.
I've given you the truth at this point. There were 27 students there all borrowing what they could get their hands on, if you think this is the kind of event that Canon is going to 'test out' secret new camera backs then there is really nothing I can say to convince you otherwise.
People just make stupid mistakes from time to time and I'm one of them. Sorry for all the excitement/trouble it has caused.
Bill Edwards, AWI
PS - why point out the 1D MarkIV over everything else? It was the last thing I was talking about with Gavriel Jecan as he was shooting the sunset at 2nd Beach running through all of the ISO settings so he could get a feel for it's performance. So it stuck in my head over everything else and it sounded like it was performing really well.
Lastly - people here mentioned/asked what Art uses - he shoots with a 1DS MarkIII and 5D MarkII. He likes the 5D for the video capability which is lacking in the former.