Whats more curious than the model number is that he (or whoever) referred to it as "the new" 1Ds4... of course the 1D4 is far from new, and Art already shoots extensively (and has for over a year) with the 1D4, so he obviously wasn't referring to the 1D4 when he said "the new" whatever...
1D2: Marketed April 2004
1Ds2: Marketed November 2004
1D2n: Marketed October 2005
1D3: Marketed May 2007
1Ds3: Marketed November 2007
1D4: Marketed December 2009
Not to cast aspertions on your character Bill, but "including the new 1DS Mark 4." That is not a typo. The 1Dmk4 is not new so I think the error was in revealing information you werent supposed to? Good attempt at trying to throw us off the scent though