Re: Trilogy / DLC ?
The content is based on the platform.
If you are on a PC you get all the DLCs for ME1
For ME2 you get the "Cerberus Network" that gives you access to "Normandy Crash Site", "Cerberus Weapon and Armor", "Arc Projector" and "Firewalker Pack".
"Zaeed — The Price of Revenge" was also available through the "Cerberus Network" but there was a little confusion lately, so I am not sure if that is still the case.
For ME3, you get the free MP DLCs and the "extended cut" plus the online pass for ME3