HiRezErez has posted some more details on the upcoming 1.3 "Sandstorm" patch. You can read the complete post here. Of particular interest is the following bit at the end:
If all goes well (there is tons of work that is being put into this update) we should be testing (some/all features) on the PTS server before the end of the month and releasing the update in May (as early as practical).
Hi-Rez's Erez Goren has posted a preview of what to expect from the next patch, 1.3. You can read the details here, but the highlights include introducing new weapons (and a rewards system for Conquest victories related to them), specialization paths for classes, and more open zones.
Patch 1.1 is now live on the GA servers. You can find the notes for the patch posted here.
Hi-Rez posters have also been dropping hints about some of the things that will be coming in Patch 1.2, which has been mentioned as likely arriving "in a couple of weeks" (source), including a 4v4 "Arena" mode with special maps, including a vertical map.
Hi-Rez's Stew Chisam posted today in the new Public Test Server portion of the forums about the first officially announced item that will be on the test server: friend lists. Take a look at the post here.
spacerecycler's keen eyes noticed a new item in the Steam Tools window - and after asking about it on the forums, HiRezStew has clarified that yes, the "GA Public Test Client" shown in the Steam Tools list is indeed in preparation for the introduction of a public testing server for new patches before they're rolled out to live. Stew estimates that more info should be forthcoming as the first large patch appears (sometimes in the next month).