Player avatars don't walk through each other in Warhammer Online. That means it's very important not to get stuck between other players and that position and protecting other players is going to be extremely important.
Sweet, not only do you get zerged, but now you can also be blocked in by the zerg!
Even if it turns out to not be what I want I'd still probably buy it, mostly because it's made by Mythic, and I really enjoyed DAoC for quite a long time.
While waiting around for it though, I've been in both closed betas for Lord of the Rings Online, and I pre-ordered the game a couple weeks ago, though LotRO isn't a highly PVP based game, it's more based on the books and questing, grouping, etc. But it is a pretty cool game.