Announcements about the X.Org Foundation and about new releases of X.Org software are made on the xorg-announce mailing list.

Press Releases from the X.Org Foundation are posted to the Press page.

(Listing mode: latest news first)

• 2013-05-23: X.Org Security Advisory: Protocol handling issues in X Window System client libraries
• 2012-06-06: X11R7.7 released
• 2010-12-20: X11R7.6 released
• 2009-10-26: X11R7.5 released
• 2009-02-01: Results of Google/X.Org Summer of Code 2008
• 2008-09-23: X11R7.4 released
• 2008-03-20: X.Org takes part in in Google Summer of Code 2008
• 2007-09-06: X11R7.3 released
• 2007-02-15: X11R7.2 released
• 2006-05-22: X11R7.1 Released
• 2006-03-20: xorg-server 1.0.2 Released
• 2006-03-20: X.Org Security Advisory: privilege escalation and DoS in X11R6.9, X11R7.0
• 2005-12-21: X11R6.9 and X11R7.0 Released
• 2005-02-11: X11R6.8.2 Released
• 2004-11-17: X.Org Foundation Security Advisory For The X Window System
• 2004-09-17: X11R6.8.1 Released
• 2004-09-09: X11R6.8.0 Released
• 2004-05-07: XDevConf 2004
• 2004-04-24: Ongoing development moved to HEAD
• 2004-04-08: X.Org Foundation releases X11R6.7.0
• 2004-02-25: Report on platform compatibility
• 2003-11-24: The Big freedesktop.org Interview on osnews.com

You can find more detailed info on the releases at Releases.