So far only the Roman units that will be built at the cities are done.
Plans for other civs include Egyptians, Greeks, Carthaginians, Seleucids, Parthians, Germanics, Gauls, Iberians, Britons, and a combined Norse-Slavic civ. These may change in the future.
Version numbering: Any version number looking like x.xxx.2 will be the version with skins done and x.xxx.1 will be without skins done.