As has been speculated, to fish for a denial. Thus, making the affair more than it really is.
If the White House denied the typewritten documents, then they sprung the handwritten documents, CBS and the Dems would have grounds for claiming that Bush was not only a slacker, but caught in a lie, as well.
Presumably, the handwritten documents would also reflect and correct the errors present in the Word docs -- such as GWB's Longmont address, the date of Col. Staudt's retirement, Army terminology, etc.
It's all too clever by half, I agree. But we're dealing with some devious and diseased minds...
I haven't heard that they have anything more accurate than what they have put out, just different details. The story from DU is that the other pilot that they have documents that indicate that the other pilot that was grounded near the same time as Bush, was grounded for using cocaine, so by guilt by association they are going to claim that Bush was using cocaine too (as per Kitty Kelley) and that he was afraid to take his physical. They have no proof of anything about the Bush physical so they are just fishing. In addition, I hear that the Guard didn't start drug testing until 1981.