It's been every two years so far. I don't see this changing now, so no. It'll be sometime next year.
It'll probably be announced at Blizzcon this year in November and even if the beta starts that day you're looking at at least 6 months of beta until the game is released. So the earliest it could be is May of 2014. And if SoO is released in September, 6 months after the release of ToT in March, you're looking at 9 months between SoO and the next expac, which is about how long Dragon Soul was around.
It will be July of 2014, It will be the Azshara Expansion, I think they will do this so they can finish up the Azeroth storylines, and move onward to whatever planet Sargeras is on, or a planet which will lead into the storyline of Sargeras
ofc not, there's no material time anymore. Plus MoP doens't even have one year.
Work on the expansion should have progressed at least somewhat as of now.
So it might just depend on what they decide to do with the game. Milk it for what it's worth -> quick expansion as people who are subscribers close to expansion launch will most likely buy it anyway. Or invest more money, more time, possibly shuffle some devs in an attempt to turn WoW around -> later expansion with more content and possibly a philosophy quite different from both Cata and MoP, which were disastrous for subscription numbers and performed most likely close to or even worse than their own pessimist forecasts.
I am sure they will not release an expansion this year. I have been in all Closed Betas since WOTLK and I have not been sent my invite to it yet. which means, it's not in beta. Since Beta testing takes a year to complete they would already be in the cycle it they were to release it this year. I do however exspect to get the announcement of both the new MMO and next expansion this year.
---------- Post added 2013-05-13 at 04:13 PM ----------
No way there is an expansion this year. That would mean just over a year of MoP and that isn't happening. We still have 3 patches left this expansion besides the pre expansion patch. There also hasn't been any beta, f&a or alpha testing done yet and those 3 stages take almost a year on their own.
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There was nothing in the recent conference call about what was on the schedule for the rest of the year that mentioned an expansion for World of Warcraft.
So that's a no.
I wouldn't be too surprised to find out that a beta for it will be available soon after Blizzcon though.
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Are people already sick of MoP? Has it even been a year yet?