Tim, the Tech Talk can be about any topic that Wikimedia contributors like you and OSM wants to discuss. I only need to know who wants to talk about what and when. Please decide and we will schedule accordingly. All the better if you can find a time slot between May 27-29.

About having the page in mediawiki.org or Meta, please decide whatever makes more sense to coordinate your work. I updated an old page page in mediawiki.org because this nowdays is the wiki to coordinate development activities. Many of these projects will run not just in Wikimedia wikis but also on any MediaWiki. What really matters is that there is one page known and maintained by all parties instead of three obsolete pages known and used only by a few.