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Doh! It's actually mentioned in the questions documentation. :-/ Though, it does seem strange to use the sort parameter for filtering. Also, it makes it impossible to get the list of featured questions sorted by another criteria (expiration date or bounty size for example - both important considerations for the bounty hunters).
Either I don't understand the meaning of no upvoted answers, or there's something wrong. I am getting "total": 683482 in the result, which is the same number SO prominently displays on the home page as total number of questions. Also, in the results list I see stackoverflow.com/questions/194812, which does not have an accepted answer, but has multiple upvoted answers. What am I missing?