EA will release a Mass Effect 3 N7 Digital Deluxe Edition exclusively on its download service Origin.

It costs £54.99. Here's what it includes:

Digital commemorative artwork of Commander Shepard.
70-page Digital art book featuring hundreds of unique and gorgeous illustrations from the BioWare development team.
Limited edition Mass Effect digital comic by Dark Horse Comics, complete with unique cover artwork.
Exclusive Digital 4x6 lithographic featuring a one-of-a-kind piece of artwork.
A full collection of in-game content that can’t be found anywhere else!
N7 Arsenal Pack – Bring the firepower with the N7 Sniper Rifle, Shotgun, SMG, and Pistol.
Robotic Dog Companion – A faithful sidekick to keep you company on board the Normandy.
Squadmate Alternate Outfit Pack – New appearances for your favorite squad members.
N7 Hoodie – For Commander Shepard’s casual days on board the Normandy.
Relive all the greatest moments of Mass Effect 3 with the digital soundtrack.
Display your initiation in the N7 ranks with a collection of forum and social badges, avatars, and perks.
Really.

Origin is EA's Steam rival, and it comes as no surprise to find that Mass Effect 3 is not available to pre-order from Valve's shop.

http://www.eurogamer.net/articles/20...origin-version