PvP is, indeed, coming. From what I remember hearing, it's going to be a "survival island" mini-game (PvPvE type deal). I'm sure we'll hear more about it in the future, but I honestly hope it doesn't because a source of balance for the rest of the game.

I would imagine that the shadow tower is probably going to be something akin to "raids" that other MMOs have. We don't have a lot of information on this yet, but the shadow titans sound very much like raid-boss monsters.

I'd love to see more flexibility on club permissions in general. Ideally, I'd love to see a /zonerestrict player <playername> to allow editing only by a specific person.

I'm not super concerned about weather changing, since there's not a whole lot of weather effects right now -- I do, however, understand the desire to use it for ambiance.

They add a new class about every 2 months or so.