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.
Translation. BGs are free, WotLK isn't