One of the conclusions after the Wikimedia Hackathon in Zürich and the Wikimania Hackathon in London last year was: we need focused attention on the newcomers. The ones we got were quite lost, and they integrated or not based on quasi-random circumstances.
From now on we need to actively reach out to newcomers, and to plan for welcoming them and integrate them to the event, with the goal of engaging them and retaining them in our community.
Note that there are different types of newcomers:
* Junior developers interested in Wikimedia, or in free software projects with a global impact in general.
* Not so junior developers interested in an international developer hackathon happening nearby.
* Local or international contributors of upstream projects used in the Wikimedia stack.
* Tech-curious contributors, not necessarily developers, but experts in some related area (web publishing, open data, geolocation, etc).
* ... ?