While these aren't official there is a strong chance they will all be in the Retail Game.
Asylum
Abandoned hospital/Cod4 Vacant style. Russian/German?
Castle
In Beta, Japanese/Marines
Cliffside
Wrecks, community member author of COD4 Map "Vertical" has worked on the map. Japanese/Marines
Courtyard
Possibly an urban Japanese style map. Japanese/Marines
Dome
Shipment-like map? Russian/Marines
Downfall
Reichstag in Berlin?. Russian/German
Hangar
Small map, Killhouse revisited? Japanese/Marines
Makin
In Beta, Japanese/Marines
Outskirts
Large map in Russian or German town? Russian/German
Roundhouse
In Beta, Russian/German
Seelow
Large Japenese Camp, Japanese/Marines
Upheaval
Destroyed Village. Russian/German
Call of Duty 5: Multiplayer Maps - RGN Wiki