If you were hoping to grab the three titles in the Mass Effect universe plus all DLC available, sadly this won't be the case says BioWare. According to the detailed FAQ, each platform will be given different DLC packs, with the added benefit of having to buy the rest presumably through their online store.

What DLC is included in the Mass Effect Trilogy?

On PC, Mass Effect will include Bring Down the Sky and Pinnacle Station on disk. For Mass Effect 2, Cerberus Network will be included which features Zaeed – The Price of Revenge, The Firewalker Pack, Cerberus Assault Gear, Arc Projector heavy weapon, and Normandy Crash site mission. For Mass Effect 3, Online Pass will be included granting players access to co-op multiplayer.

On Xbox 360, Bring Down the Sky and Pinnacle Station are not included with Mass Effect, however they are available as stand-alone downloads through Xbox LIVE. For Mass Effect 2, Cerberus Network will be included and Online Pass will be included for Mass Effect 3.

Information on PlayStation 3 DLC will be available soon.

Luckily though the odd choice of what DLC is given to who will not hurt any of your current Mass Effect saves, or the multiplayer in Mass Effect 3.

The trilogy has been dated for a November 6th release, however PlayStation 3 users have been left in the dark with only a "TBA" to comfort them.