Update NEWS file for 4.0.0

NEWS

                           -*- mode: outline -*-
-* Major user-visible changes between ekiga 4.0.0 and 3.2.7, details are below
+* Some major user-visible changes between ekiga 3.2.7 and 4.0.0, details are below
 - Major overhaul of the main window
 - Use gnome icons instead of ekiga's own
 - Re-add back H264 and H263+ video plugins
@@ -21,7 +21,7 @@
 - Jabber/XMPP and GStreamer fixes
 - [windows] Support mingw-w64 and its own headers for building
 
-* Changes in ekiga 4.0.0 (2012-11-25)
+* Changes in ekiga 4.0.0 (2012-11-26)
 ** User-visible fixes
 - Fix call auto-answer
 - Fix group renaming in roster