Siege vehicles in World of Warcraft, Wrath of the Lich King will be pilotable by players and look to be quite powerful. Unfortunately, their use will be limited to the Lake Wintergrasp and Northrend Battleground zones. Currently, none of them can travel through water. Different races have different siege vehicles (similar to mounts), but they can be used by any race. They are not owned like a mount or used as an inventory item like any World of Warcraft mount. They are all relatively slow as far as travel speed, and some can carry more than one player. These siege vehicles definitely look like they will have a significant impact on World of Warcraft’s Player vs. Player (PvP) combat
This is the baseline vehicle upon which the rest are based. It has both short and long-range attacks and a ram attack. The vehicle can also carry up to 3 passengers as well as a driver. In this vehicle the passengers are exposed, allowing them to be targeted and attacked – but also allowing them to do the same. The driver is also in control of both weapons. (Source: wowwiki)
This vehicle is much quicker than The Demolisher, with faster acceleration and quicker turning speed, but it doesn’t have as long a range as The Demolisher and doesn’t do quite as much damage. It also carries no passengers, but has a frontal flame attack. This is the lowest cost vehicle available. (Source: wowwiki)
The hardest hitting and longest range vehicle of all, it carries a driver, gunner, and passengers. Unlike the Demolisher, the passengers are not exposed. The driver controls only a frontal ram attack, while the gunner is control of a fully mobile turret. (Source: wowwiki)
A flying vehicle that is very quick but fragile, making it ideal for transport. It is highly vulnerable to anti-air weaponry. Carries a pilot and a gunner. (Source: wowwiki)
A flying vehicle bomber variant that was not shown at WWI. It was only mentioned that it will carry both a bomber and pilot, allowing it to drop bombs over the battlefield. (Source: wowwiki)
An anti-air vehicle that fires rockets and can rocket boost into the air to reach air vehicles or jump over walls. It essentially acts as a personal armor suit — if the suit is destroyed, a player can jump out and keep fighting. It has a close-range melee attack but is vulnerable to siege vehicles. (Source: wowwiki)
The method of obtaining them has not been revealed. The design goal is to make them exciting and the rush to obtain them fast paced and frenetic. Some fans have complained that these vehicles do not look “cool enough”, but they seem to fit World of Warcraft’s visual style as far as I can see from these early concept pictures.