Blizzard already has concepts for another "six or seven" World of Warcraft expansions, says game director Tom Chilton.

The developer is in active development on the World of Warcraft expansion that will come after this year's Warlords of Draenor.

"We already have zones in production for it", said Chilton.

In addition, Chilton said Blizzard will determine the theme of the expansion to follow that expansion "over the next several months".

"Beyond that, there are about six or seven different ideas for expansions that we can take elements of and say, ‘You know what? Let’s take that and put it in this one for our next expansion after the next one.’ Or we might shift the timelines around from what we originally envisioned. There’s easily 10 years worth of stuff that we can draw from – more, really."

"As long as there are enough players demanding that we make more content then we’re likely to do so," added Chilton. "I think it’ll be quite a while before the financials indicate that it’s just not worth doing anymore."

Read our full interview with Tom Chilton, which covers the past, present, and future of World of Warcraft.