Google hinted a few months ago that more search query data would be accessible to webmasters by the end of the year, much of that is part of the new Search Analytics reports (formerly Search Impact reports) within Google Webmaster Tools.
But Google's John Mueller said they expect to add the full search query data to their Webmaster Tools API in the "upcoming quarter."
John said this in response to a question asked at 34 minutes into the Google+ webmaster hangout yesterday.
The question was:
Is there any way of using the Webmaster Tools API to download top search queries/keywords and top linked pages for our sites? I've read the API cannot be used this way, but can you confirm? Is there an alternative way to download this data?
John answered:
That is something that will end up in the API, I am guessing in the upcoming quarter. So not immediately but probably later this year you’ll also have access to the search query information within the API.And for that, of course we also need to make sure we have the full Search Analytics feature launched first so it is kind of waiting on that as well.
Very exciting.
Forum discussion at Google+.