We will announce the winners as soon as they are ready to be published in the Software Center.
Vote was closed on the 29th and the votes have been counted already. It just takes some time to do the technical review, fixes (if necessary) and developer communication to get the winner's apps into the Software Center.
We are aware that this process causes unwanted delays, and we're actively working towards improving it. If you are interested, we're also soon going to announce a proposal for a more streamlined process for 3rd party apps to be published.
Note: Essentially, @Tom Brossman's answer is correct, as we're going to announce them as soon as possible. But note that as mentioned in the community vote start blog post, we decided to start the vote without blocking on all apps having gotten into the Software Center. This means that we're not using the public ratings and reviews Software Center API (but the results will be equally public).