here is a quote from one page i read about the series.
Artisan Entertainment hasn't released too much information officially about this event. I have emailed them several times and for each answer they give me a new release date... The current date is set to November the 14th. Rumors say that it will be 6 discs and the original pilot is to be included.
Information from www.dvdfile.com
DVD format will be DVD18(double sided, double-layered)
Aspect ratio will be the original 1.37:1
David lynch on DVD is another good site with lots of info on all david lynch releases on dvd.