Age of Conan is said to have some promise. The developers are even open to a server with rules like looting and open killing. This last week they showed a demo and gave some info about their siege system at pc.ign.com.
“The basic plan is to form a guild then begin constructing buildings in predetermined areas of the game world. Cities will start out quite small, first as trade posts and small houses. Eventually guilds can add fortifications and larger buildings to their claimed area, along with high walls and an inner keep.”
“However, cities won’t necessarily last forever. Since there are a limited number of spots to build on in the game world, invariably other guilds will be looking to sack your city to set up a home of their own. While medium to large cities will be low instance areas because of all the activity, they will be prime places for guild wars. “
This sounds like a much better system than shadowbane where you could have unlimited amount of cities flooding the map. Siege also appears to happen in time windows like shadowbane. As for siege weapons,
“To prepare for the battle, the attacking forces can build huge siege engines such as ballistas, as well as ride into battle on war mammoths, rhinos, and stallions. Ballistas can be set to aim at specific strike points in the city to weaken defenses, and war mammoths and rhinos can be used to knock down gates and walls. If the attacking guild doesn’t have enough members online during the battle window, they can recruit other players to act as mercenaries for their side. After the battle begins, attackers only have a certain amount of time to enter the defending guild’s battle keep in order to capture the city for themselves.”
The game has recently been delayed until late 2008, but beta may not be to far off. If you haven’t done so already. Sign up for beta here: Beta Application