World PvP in Guild Wars 2 will make use of some RTS elements according to information gleaned from a translated Dutch magazine article on Guild Wars 2.
The information was dug up by the folks over at Kill Ten Rats:
The World PvP Maps bear a resemblance to RTS-maps and give you a chance to play different roles. You can conquer stone mines, which will then deliver stone by caravan to your catapults, you can attack and cut off caravans of the enemy, you can operate as a scout and inform the rest of hostile movement, you can man watchtowers and defend, or you can just run up to a lost PvP’er and teach him a lesson. All these actions will earn you experience.
You can read the full report here, where the design is compared to a bit of a combination between Warhammer Online's RvR and World of Warcraft's Alterac Valley.