The 31st, I believe, is only for the online submission ... the DVD will likely be do within a week or two after that. Which THAT deadline will probably be that it has to be at their door by that date, as they've got to get working on laying everything out, authoring, etc.
No instructions yet that I've seen, but I'm sure we'll be sending the DVD's to the Blaine, WA address ... unless Jarred's already moved to Los Angeles by then.