Some of the Press Release can be a bit confusing, if not read Correctly. Basically MP makes it easier to get the "Ultimate Victory" Ending if I'm reading it correctly.
"Success in multi-player will have a direct impact on the outcome of the single player campaign, giving players an alternative method of achieving ultimate victory against the greatest threat mankind – and the entire galaxy – has ever faced."
"It is important to note that the system is entirely optional and just another way players can have control over your game experience – it is still possible to achieve the optimal, complete ending of the game in Mass Effect 3 through single-player alone."
Just got my Commander Shepard white t-shirt. Gotta say it's awesome! Well spent cash.
On BioWare Store Front, The Normandy SR-2 Repica Ship(Both Versions) should be shipping Sometime in November for those who ordered it.
I Grabbed the Alliance Version, I hated the look of SR-2 with all Cerberus Colors and Logo painted on it(For being a Black-op Division, They put their logos on everything).
Pay attention to around 2:30 Mark, Casey Confirms you can get the most complete Ending even if you never touch the MP part of the game. MP just adds another way to get that Complete Ending.
If you’re one of those gamers that loves to complete every piece of a game, then you’re in luck. By doing enough in the singleplayer campaign, you will be able to earn enough War Assets, you won’t have to participate in the “galactic war”.