"Why do we only have four battlegrounds in World of Warcraft?" has been a consistently popping question in the WoW forums. You'd think that with all the complaints players have been fielding, this would be the last thing they'd be asking for, but apparently some just want more battlegrounds.

Some have even openly stated that it shouldn't be too difficult to implement this considering that you just assign a location and put some objectives up. Well, sorry to disappoint you guys, but apparently, it's not that simple. Blizzard Poster/ Forum Moderator Nethaera clarifies this while at the same time giving some interesting tidbits of information:

We do have plans to add more battlegrounds in the future. How many, I couldn't answer for you at this time. There is a method to the madness, however. Mostly, it has to do with making sure there is a healthy population of people to take part in the battlegrounds.

If we have too many battlegrounds, the population will thin out and queues will go up. Where Arenas are quick battles that don't need a lot of time commitment (based on limiting how many games a team may choose to play beyond the minimum), battlegrounds tend to take a bit more time and have no real downside for playing them almost exclusively if people choose to.

We have more plans in the future in general for PvP though nothing more concrete that I can share with you right now. It's common knowledge that an expansion is in the works. More on the details will come in time as to what all will be included in it.