13 Halo 3 maps discovered?

A list of 13 maps was found in the Halo 3 beta code. The list is as follows.

• Chill - Halo 3 Chill
  
• Construct - Halo 3 Construct
  
• Cyberdyne - Halo 3 Cyberdyne
  
• High Ground - A relic of older conflicts, this base was reactivated after the New Mombasa Slipspace Event
  
• Guardian - Halo 3 Guardian
  
• Isolation - Halo 3 Isolation
  
• Valhalla - The crew of V-398 barely survived their unplanned landing in this curious gorge
  
• Epitaph - Some believe the Forerunners preferred desolate places. Others suggest that few other sites survived the Flood
  
• Shrine - Halo 3 Shrine
  
• Snowbound - Hostile conditions did not prevent the Covenant from seeking salvage on this buried Forerunner construct
  
• Warthog Inc - Halo 3 Warthog Inc
  
• Last Resort - Remote industrial sites like this one are routinely requisitioned and razed as part of Spartan training exercises
  

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