Last I heard they are filming season 3 right now, it is set to come out Fall of this year. It will consist of 3 additional episodes, considering the length of the episodes, this was kind of to be expected. I'm looking forward to seeing more.
There is a lack of recent information about it, assuming it's because Watson was filming for The Hobbit but I haven't heard otherwise that it isn't still on the way.
Yeah, they're shooting Season 3 as we speak, and have announced a 4th season as well. Here's a pic from a couple nights ago where they shot a scene outside in Bristol:
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