Gamespy has a 5-pages preview of both Battlegrounds zones: Alterac Valley and Warsong Gulch.

Miguel: This, in my opinion, is the definitive WoW PvP experience. The map is huge, densely populated with players, NPCs, and monsters, and it greatly rewards coordination and strategy. Case in point: try taking the Alliance base without both Lokkmar (the huge, summonable epic boss that aids the Horde in its assault) and a group of beefed-up wolf raiders. It’s impossible. The arches on those last two guard towers will chew you up, not to mention the entire Alliance raid that’s sure to have gathered in the meantime. It’s insane. My last match lasted six hours, and I got over 1,000 honorable kills. It was really late at night by the time it was over, but once we took that last graveyard, and destroyed one of the last guard towers, I knew it wasn’t going to be long.