These don't seem to be the same as you've suggested. As Chunk pointed out - you can now camp out of an instance and it remains for all the members of the group.
There is definitely a discrepancy among various players about their experience with this. Some people seem to always be able to get back into their instances, whereas others cannot. I personally am extremely lucky if my instance comes back after logging out, disbanding, or disconnecting.
I'm just curious why there is this discrepancy. Perhaps the game client matters? I'm using UF. I also always make the same character my group leader, and that character always creates the instance (on somebody random's waypoint, however).