Attorney-turned-military-historian Tom Carhart has reconstructed Lee's intentions at Gettysburg in a new book issued by trade press Putnam one week ago. In Lost Triumph, he argues that Lee intended three synchronized hammerblows on day three, of which Pickett's was just one.
This is an interesting speculation that includes peeks into Lee's West Point lesson plans. It delivers good news about Custer and (more) bad news about Stuart.
Let's see how the Gettysburg experts respond.
Update (5:11 pm): I've started a thread on Usenet; the deeper Gettysburg readers are not impressed, judging by the first responders. See for yourselves.