At this point I don't even hope anymore. Sadly, despite outright denials in the past (
social.bioware.com/forum/1/topic/103/index/7166239 ), at this point multiplayer is pretty much a done deal and all that's left is official confirmation. First they pushed the release back several months (something Dragon Age 2 really, really could have used), now they have a "killer new feature" (insert mandatory "killing the game" joke here!) soon to be announced, and according to Destructoid a ME3 ad has been spotted mentioning an "online pass", the obvious implication being multiplayer.
What annoys me the most as that the Dragon Age 2 lead designer went on the record to say that the recycled environments in Dragon Age 2 were due to a "lack of resources" to make more unique areas, and now they they are spending extra time and resources adding a half-baked multiplayer mode in a misguided attempt to make Mass Effect "mainstream" that will accomplish nothing but make the single-player campaign, the only reason anyone will play Mass Effect, shorter and worse.
Seriously, publishers, this isn't rocket science. Who the heck bought Dead Space 2 or Bioshock 2 because it had multiplayer? With so many real multiplayer games out there for gamers who want them, who's going to choose a game with a shoehorned multiplayer mode?