The GeoServer release schedule been extended with a six month maintenance phase. This change will result in less frequent releases of GeoServer, for a longer period of time.
The updated schedule for the GeoServer is 2.4 series is:
GeoServer 2.4.5 March 2014 (Stable)
GeoServer 2.4.6 April 2014 (Maintenance)
GeoServer 2.4.7 June 2014
GeoServer 2.4.8 August 2014
For more information please see the change proposal GSIP 107 - Extended Release Schedule.