jQuery 1.8.2 is out, and new users of the 1.8 line are advised to read the jQuery Blog posts for 1.8 and 1.8.1 before upgrading. This version adds a lot of fixes to the selector engine's pseudo class handling, including
jQuery UK 2013 has been announced for the 19th of April in Oxford. Early bird ticket will be £160, but there are also 'blind bird' tickets available for £130.
To apply to speak at the conference, complete the proposal form. Speakers can also be suggested by the community: jQuery 2013 - Suggested Speakers.
There's a talk on jQuery Mobile and a few on Sencha's various technologies. I also noticed a Backbone.js talk, and one on Node as well. The speakers page has details on all of the talks and workshops.