City of Villains Preview

1Up has released a preview of Cryptic Studios' City of Villains, based upon what we know about the superhero MMORPG expansion so far. Check it out:
But the feature we're really excited about is the PVP action--so long as it provides a worthwhile experience with both risk and reward. The arena combat in COH's most recent content update gave us a taste of what's to come, but the prospect of full-fledged heroes-versus-villains melee matches is a far bigger deal. How is this system going to be handled? We assume that villain characters won't be able to just stroll through Paragon City unchecked (same goes for hero characters trespassing in the new Fallen Isles area), which would logically rule out a fully consensual PVP experience. Will we be able to lay the smack down when an upstart group of villain characters walks into the city?