http://www.reddit.com/r/Guildwars2/comm ... last_beta/
There's only 4 structured PvP maps in atm, the two you guys are familiar with and two more. The other two are called "Memories of the past", which is basically a conquest map mixed with some oldskool GvG elements mixed into it like killing guildlord wins you the game and "something something Capricorn", which is a coastal map with a huge pirate ship, water and beaches.
Obviously you can't just walk up to the guildlord and kill it easily. It takes time to get to him even, there's a castle gate and bodyguards and it's fairly close to the enemy teams spawn.