Elite Marks

[Keres]

This is how I interpreted it:

1. Regular marks would be quests to go out and kill some monsters in the world, sort of like Animus books.
2. Elite marks would be like treasure maps, where you can form a party to go out to the proper location, pop the monster, and kill it as a group. The fact that everyone gets the same elite mark would be so that you don't have to do 8 different elite marks to get everyone in the group their completion.

[Shinun]

The thing is though Treasure Maps said the mobs would be popped by clicking on the caskets the only "appear during certain conditions" could mean that but, it could also mean time/weather/etc. Also when we saw the treasure maps in the video you saw them actually spawning the monster in the trailer. In this trailer their walking up to an already spawned bear.

That leaves me to believe the marks are not spawned like maps and that they'll be a free for all like Odin/Behemoth