Akshay Chugh on the Convention Extension: http://lists.wikimedia.org/pipermail/wikitech-l/2012-June/061362.html (looks like the Wikimania 2013 organizers are working with him to make it work for them!)
Ashish Dubey on realtime collaborative editing: http://ashishdubey.info/blog/2012/7/5/realtimeve-first-demo.html (new demo!)
Aaron Pramana on the watchlist: http://mw-watchlist.tumblr.com/
Nischay Nahata on SMW optimization: https://greensmw.wordpress.com/
I'd love to hear more from:
Robin Pepermans on Incubator: https://gerrit.wikimedia.org/r/#/q/owner:SPQRobin,n,z
Platonides on the native uploading app: http://thread.gmane.org/gmane.org.wikimedia.wikilovesmonuments/2641/
Harry Burt on TranslateSVG: https://www.mediawiki.org/wiki/Extension:TranslateSvg/2.0
Ankur Anand on UploadWizard: https://gerrit.wikimedia.org/r/#/dashboard/144
Suhas Rao, on OpenStackManager: https://www.google-melange.com/gsoc/proposal/review/google/gsoc2012/suhasmon...
Robin, Platonides, Harry, Ankur, and Suhas: please reply to this thread with updates on how you've been doing. If you're running into any obstacles, please speak up!