from article (paraphrased a little) regarding the PvP stuff:
"Factions will also overhaul guild play by introducing Alliances and Factions. Guild can form Alliances with one another, and take control of cities in Cantha by undergoing special missions where teams compete to control resource points. In Factions, guilds ally with one of Cantha's two warring factions and have PvP battles for territory."
I honestly have no idea what a resource point is........but hey sounds like PvPing has a twist.
regarding skills:
"...Factions owners will also enjoy a total of 300 new skills, including 90 new elite skills for all eight profession, plus hundreds of new weapons and items."
more combo's galore *rant over*
