Don't hold your breath, of course (this is Blizzard we're talking about) -- this would be after the current real-time strategy game is done, and Pardo says it would be "one of the the ideas on the table," so it's not exactly in the planning stages yet. But it's interesting to hear that Blizzard may still return to the Warcraft universe under the RTS banner -- we've seen such a different aspect of the world in the MMO, it would be very strange to go back to controlling these units from the top down.
Pardo also says that a console version of WoW is pretty much out of the question at this point -- if there is going to be a super-successful console MMO, it's not going to be World of Warcraft, as this game was designed for PC and has gone through so many iterations since that Blizzard isn't at all interested in trying a port. We are still waiting for that playable version of the Molten Core console game, though...
Update: Whoops, the interview is a bit old (Pardo said this last year). Still, news to me that Blizzard might bring RTS back into the Warcraft universe, but considering that Starcraft II doesn't even have a rumored release date yet, we're going to be waiting a long, long time.