Shuttle Atlantis has been handed a flagship finale, following the confirmation that she will now be the orbiter that will conduct the Hubble Space Telescope servicing mission, with the launch date slipping to September 11, 2008. The decision to swap STS-125 – known as HSM-04 – from Discovery to Atlantis was confirmed by the January 8 launch schedule document, which sees a widescale change to the shuttle mission manifest.
Source: NasaSpaceFlight.com