"Osiris: Vision 81"
This one is also relatively simple to get. Start "The Black Garden" mission on Mars, and proceed all the way until you actually go through the portal into the Vex area. Once in here, continue through the mission until it has the first "Darkness" zone, and you can see the stairs leading to the light outside. Continue around this corner until you see the large purple Vex wall/structure that is on a slant to your immediate right - the ghost will be on this but on the other side. To get to it, when you are approaching this Vex structure there are two little blocks in the ground along the walk-way. Jump on top of the second block and then face the side of the Vex structure it is in front of, and you will notice a little hole inside the Vex wall. Jump up into that hole and the dead ghost "Osiris: Vision 81" will be in here.
Full credit to /u/Asthralas for finding this ghost and letting me know where it was.
For the other 10 dead ghosts found in the 2.0 patch, they can be found here: https://www.reddit.com/r/DestinyTheGame/comments/3knio4/text_videos_guides_for_all_10_new_ghosts_added_in/
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Edited by NoHumorMan: 9/28/2015 8:31:05 AMA friend of mine found a dead ghost on top of Variks' tent up on the Reef. I thought it was the yr1 dead ghost, but I had all those and I found the ghost laying there too. The second I found in the mission: The Promethean Code. In the corridor where you first encounter the Taken there are three small platforms. It is on the last platform, nestled just past the crate at the left side when scaling the platform. Haven't seen these in the lists so far.