See the Changelog for list of features and fixes.
Activity indicator in tabs.
Submitted by nineinchnick on Thu, 02/16/2012 - 12:13
AFAIR I've seen it in old slsk client, when something happens in a tab it get's an activity indicator on the tab list in a form of an asterisk or icon. Examples: search results updated, new chat messages, download (folder?) complete. New uploads queued.