There will be no offline or network option as character data is stored server-side not client-side to prevent most hacks/alterations.
As for differences between alien genders, that assumes sexual dimorphism which you could agrue might not exist.
Some animals that do exist are not sexually dimorphic which means there's no visual way to tell the males from the females.
So basically alien races like the cabal may have no visual difference, lore wise.
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Or they could be hermaphrodites like snails.
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Edited by Sledgehammer73 : 9/20/2013 7:05:15 PMBut they did confirm you could play solo if you like, you just have to be connected.