Drysc had the following to say in response to all the changes being made in WoW PvP, or lack thereof.
Regarding spec viability we would definitely like to see every spec at least partially viable, that doesn't mean however that each spec will be equal in a very cutthroat PvP environment like the arenas. A prot warrior or shadow priest or what have you should though be able to jump into a battleground or arena and be able to do something with some small amount of success. How much success that should be is really the question, but our general philosophy is that we're ok with some specs not being as viable as others, we sort of have to be.

There's a synergy within the classes for PvP, as well as PvE, that doesn't lend itself to a model where every spec is exactly the same, exactly as viable as the other, in every situation. At that point we start watering down classes, watering down abilities, copy and pasting, the focus of the game is lost, dogs and cats are living together... mass hysteria.

Moving on to battlegrounds I don't believe we've ever stated that we have fewer maps to keep queue times short, that's not an issue. The issue is the amount of time it takes to create a battleground, and balancing that work time with other areas of the game. Battlegrounds are very labor intensive, Warsong Gulch which is probably the smallest of the battleground maps still has some terrain issues here and there. Playtesting, balancing, making edits, all require a very large amount of resources to ensure a successful battleground.

Now, that's not to say we aren't willing to put in the time, only that we have an entire game to put resources into, and those resources have to be delegated appropriately. The entire team is now working full force on Wrath of the Lich King, and the new battleground it also includes. Hopefully there will be some time to get additional battleground maps into the mix even after it ships. Personally though I think I'm most excited about Lake Wintergrasp just to see how it turns out.