Saw at elitevideo.com that Sony now has an interface box to go back and forth between S and Firewire. Not the all-digital solution we've been waiting for, but opens a path to record analog video onto a VX-1000 or whatever. Elite's price is $499. Their prices tend to be a bit high so it may show up elsewhere for less. There are pictures on Elite's site.
Several other companies are making these now. I am using one by a company called TV One. It cost about $250 from B&H, does firewire to S or S to firewire. Unbalanced stereo audio also makes the trip either direction. It works great.