The official website has been updated with some details on the outdoor PvP objectives that will be showing up in the upcoming patch. There's nothing unexpected here, but it does fill in the gaps in the initial announcement of the addition. At this point, it's clear that there are no great rewards for participation in these world events - those playing in Eastern Plaguelands will be rewarded with increased damage against undead buff (higher depending on the number of towers your faction controls) and those playing in Silithus will also receive buffs (though of unknown nature). As it stands, I see the event as a distracting mini-game that won't have a lasting effect. But if anyone else sees it otherwise, I should love to hear it.