A new Mass Effect 3 trailer has surfaced, detailing the contents of the $80 Collector's Edition bundle, which shall include (in case your eyes fail you)...
A metal case that has both male and female default Commander Shepards
A hardcover 70-page art book
Limited Edition Mass Effect comic by Dark Horse Comics
Exclusive 4x7 lithographic print of SR-2 Alliance Normandy
N7 Arsenal Pack featuring N7 Crusader, N7 Eagle, N7 Hurricane, and N7 Valiant
Mass Effect 3 digital soundtrack
Alternate costumes for Liara T'Soni, Kaiden Alenko, and James Vega
An N7 Hoodie for Commander Shepard
A companion robot dog
An unmentioned fabric N7 patch
A "classified" bonus character and mission (which should be available as a standalone DLC pack, lest we get complaints by Mass Effect completionists)
A close-up, found by PC Gamer, of the promotional video pulls up an image of Jack, though we're not sure if it's just art material and if Jack will be playable at all (particularly if she died in the ME2 playthrough).
Mass Effect 3 will be released on the masses (see what I did there?) on March 6, 2012 for X360, PS3, and PC.