I just spoke with guest services, and I got several important questions answered.
1)Black-out tickets for Annual Passholders will NOT BE AVAILABLE for 7/17. The word came down from TPTB to Guest Services today. D'oh! They are going to make a mint on us.
2) The Timon lot will be open at midnight (so presumably it won't be closing), and the ticket booth will be open at 1:30 AM. Guest Services said that they have to vacate Disneyland before they can begin the line-up into DCA.
3) There will be no free-roaming on line at DCA. If you leave the line you will need someone to hold your place for you. There will be nowhere to sit other than the ground.
4) For guests who have need of a wheelchair (or heck, whose legs get tired after standing or sitting on the concrete for four hours) the rentals will become available at DCA at 3AM.
All things are, as they said, subject to change without notice!