Its a double decker as far as the flt deck access goes, basically the same as the B747-classic freighter, infact the upper deck is a smaller area i would presume. The stretched version of B743/4 have the access to upper deck close to the #2 doors, in this case it will be a drop down ladder like the classics.

The main deck cargo will be a single deck as vivek mentions, they need the volume to fit the B787 Fuse.

I am not sure about Boeings intention in future to go for a full length double decker, however this a/c design doesn't seem to be ideal for a DD. The down wash from the fuse at the aft end will be loading the horizontal stabilizer causing problems with pitch control. In the case of this a/c they might have re-set the H/Stab neutral slightly nose down position...........guessing.

She finally takes to the air

Boeing 747 Large Cargo Freighter Arrives in Seattle

SEATTLE, Sept. 16, 2006 -- Boeing (NYSE: BA) today celebrated the arrival of the first of three specially modified 747-400 passenger jets that will be used to transport the large composite sections and wings of the all-new Boeing 787 Dreamliner. The 747-400 Large Cargo Freighter (LCF) touched down at Seattle's Boeing Field at 8:08 a.m. PDT, ending a non-stop, 13-hour, 17-minute flight from Taipei, Taiwan.

The LCF's arrival in Seattle signals a new phase of the airplane's flight test program, which began when the airplane made its first flight in Taipei on Sept. 9, 2006. Since then, the LCF successfully completed two additional flights, which demonstrated its airworthiness and ability to complete the ferry flight to Seattle.

http://www.boeing.com/news/releases/2006/q3/060916a_nr.html