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It appears as though GW2 accounts will be locked into one "home server" for WvW.
That is, all characters for one account are limited to their original server for WvW. You cannot reroll on another server to WvW for them. If you want to switch servers, you must pay to move your entire account.
From the official blog:
Some of our more astute fans asked about the complications involved with switching servers and how it would interact with world bonuses. Every account has a home server where your characters are created. You can only fight for your home world in WvW. You can visit other servers, and while you are visiting, you still get the world bonus from your home world instead of the bonus for the world you are visiting. If you switch your home server, you lose the bonus from your previous home world and are not eligible for the bonus for your new server at least until the beginning of the next battle for the Mists. We may extend this disqualification into the next match or possibly even longer to discourage people from switching servers right before a battle ends in order to get an awesome bonus. You will have to pay a fee to change your home server (price undetermined), and that will also discourage people from server hopping to chase world bonuses.
This is making me reconsider buying GW2. A good community is my bottom line for playing any game, more important than winning or losing. Not being able to reroll to find a good server is a serious flaw.
Rithwis, Righteous Golem of Camelot | Skritha, Orc Archer of Tamriel | Bloodwod, Sawbones of Auraxis | Thrumdi, Blue Norn of Tyria | Gwidwod, Spider of the Ettenmoors | Gideon Slack, Hunter of Alsius