Reminder: if you're going to Wikimania in London this year, you can ~~~~ for the sessions you want to attend. That helps the reviewers "decide which sessions are of high interest". Tech-related stuff is mostly in:
https://wikimania2014.wikimedia.org/wiki/Category:Technology_%26_Infrastruct...
https://wikimania2014.wikimedia.org/wiki/Category:Open_Data_submissions
Stuff that caught my eye includes presentations on "Mesh Sayada, a free community network for open data and free culture", Kannada digitisation, TogetherJS, Wikisource infrastructure, an Athena Project update, structured Wikiquote, site performance, "How the LCA team uses technology to scale", ridiculous browser bugs, and technical & social aspects of anonymous editing.