Since Farrin launched the system, I'll give you the list of current planetary capital (cities) and the 3 planetary regions. This information WILL be added to the Systems Manual at a later date.
Hades - Tartarus
    1. Ignis
    2. Promethei
    3. Penates
Ashtar - Sheran
    1. Calmesia
    2. Khalania
    3. Taria
Osiris - Bastet City
    1. Gebinis
    2. Hatham
    3. Thothes
Ghenna - Hebra
    1. Antrophaga
    2. Villimus
    3. Glacia
Thor - Mjolnir (name shared with moon)
    1. Dolabra
    2. Donar
    3. Thunaer
Ullyr -Â Serazin
    1. Fascetia
    2. Liginia
    3. Dasos
 The names were taken, for the most part, from (a) The Sysman (particularly for Ashtar) (b) Latin and Greek (many of the names are derived from words relating to the planet - I tried to make them sound appropriate) a few are taken directly from those languages (c) mythological people, objects, or geographic places.
 Yes - they all relate to the planets! :)