I am just back from Mediawiki Berlin Hackathon. 
On May 13 to 15, Mediawiki developers attended the hackathon and squashed many bugs and discussed many features. Members of language committee had its first real-life meeting in parallel with hackathon. It was a nice event, learned a lot, talked to many awesome hackers and linguists.
- Milos Rancic has written a summary of the discussions happened during language committee meeting here : http://lists.wikimedia.org/pipermail/foundation-l/2011-May/065537.html
- Niklas Laxström and Siebrand reviewed the WebFonts extension and enabled at translatewiki.net. Fixed a few bugs that Niklas reported on the extension.
- Purodha Blissenbach was very much interested in the WebFonts and Narayam extensions, we discussed some of the features we need to add. We have it here: Bug 28900 , Bug 28999 and Bug 29000