We realize this is a complicated and controversial subject and are still debating the issues internally. More on this later.
Source: Official FAQ
We are not currently planning to have premium servers.
If we did, they'd need to damn well be worth it, and clearly offer more and not just what a player might expect anyway (easier said than done).
So I'm not ruling one out, per se... maybe we'll think of some good way to do one that players feel good about and that we feel good about. But no current plans.
Source: Aradune Mithara