A few words about the 7th edition rumors from The Overlord:
Unbound Armies are lists without an FOC. Examples given are riptide/Broadside lists or leman russ lists. There is a lot of potential for narrative gamers. Lots of fun things can be had here, when you just take x points of whatever fits your scenario. I'm very leery of this due to my competitive nature. I am already building insane lists in my head based on this free form style. I would think this type of game would require a little more fore-thought from the players involved, to ensure there is some reasonable amount of balance and a fun time.