KingOfDust: GW2 World vs World sounds awesome
Lexor: Have you played GW1? If not that your sentence could be true.
If yes, it is a little surprising. WvW seems like enhanced AB mode - it could have too much chaos inside, less strategy as there is hard to control whole battle. WvW needs some command center.
Yes I've played GW1, but never tried Alliance Battles, as I wasn't too interested in GW's PvP. Obviously large battles are going to be chaotic, but hopefully guild-groups are going to be somewhat organized, and share objectives in a way that make sense. Communication is going to be important though. You'll want scouts keeping an eye on enemy movements and relaying this info to the others, small groups dealing with supply nodes and convoys, and larger groups dealing with keeps.
Since the battles will 2-weeks long, and you'll always be fighting alongside people/guilds from your server, hopefully after a while there should be some semblance of organization. But yeah, it's going to be a mess in the first few weeks.
On another note, just signed up for the Beta. I never get chosen though.