Every single raid in MoP has been 100% linear, so you move from one boss to the next to the end boss, this being caused by the introduction of LFR. I'm not saying there is anything wrong with that, but it is nice when we had raids like firelands for example that are a big open area, with the exceptions of a few bosses, you could go fight any boss at any time. Although there will be some linear raids in WoD, I looked at the map for the blackhand raid (I can't post links as it is a new account, google WoD Blackrock Foundry map and have a look.) So as you can see this one is quite a bit more open than every single raid from MoP, although looking at the picture you can see where three possibly four wings of the raid will be split up for LFR. I thought this was pretty cool and we could possibly see some other upgrades to have it expand for it to work on a fully open area.