7月16日にSerendipity 1.2-beta4がリリースされてます。
(beta4) Fix comment-RSS feeds
(beta4) serendipity_plugin_comments now also supports Favatars in
combination with serendipity_event_gravatar instead of
Gravatars only. (brockhaus)
(beta4) Fix wrong event hook for entry manager to display toolbar
for the main body area.
(beta4) Stronger autologin cookie encryption, prevent mixup with
template options (which could make foreign users delete your
configured template option keys). Also use new serendpity_db_implode()
function for a safer API on image handling.
All hail Stefan Esser. 
(beta4) Backend templating changes to insert more classes to input
fields etc (Don Chambers)
(beta4) Fix invalid pingback XML code, by Slim