I haven't really done many dungeons in MoP since getting what I can from them but I have noted that sometimes I will get a satchel even if when I accepted the queue no satchel would have been rewarded. That being said, I have never "lost" a satchel queue in a group provided that we did not re-queue in the middle of the instance due to someone leaving group, so it leads me to believe that re-queueing rewards a satchel based on the needs at the time of the new group formation, not the original group.
In short; who knows?