Considering this isn't a subscription-based game (meaning they actually have limitations on how much content they can implement) I'd much rather have them focus on content that actually affects gameplay.
Don't get me wrong, I want to see that aswell, but looking at other games [such as Halo 3, Dawn Of War for example] where you can customize your troops, it's not much but it adds much more character to a game. Thinking back on this idea, it could be released like Sins Of A Solar Empire's Entrenchment micro add-on was, add a single player story mode within which you would unlock new 'looks' and personal demigod gear for each demigod, not only changing the appearance of the demigod, but adding new stats, depening on what gear you would wear, would affect what build you would choose for your demigod. i know it is a bit far fetched, but it's just a moment of whimsy i had. Another note, i know it would be hard on Stardocks behalf, due to the limited contract with GPG [in regards to demigod], but i could see it pulling many new players. As i can see it, if Demigod is to survive, it needs to evolve over time.