| If I were you, I'd look for artists sometime soon and get them to start working on getting stuff generated in Maya or equivalent and find a way to import it into the game's terrain editor. Overcoming that hurdle can be difficult.
Also, if you can't expand the terrain easily post-release (believe me, I've had similar problems with the game my team is making now that's using Unreal's engine), I'd suggest you implement empty shops like Blizzard has done with WoW.
Other than that your list seems good, but again, plan small for the first iteration, put placeholders etc for your stuff and don't spend a great deal of time implementing things like quest scripts for the gods in your temples until you have the technology for the temple and the temple itself in. All stuff I'm sure you're aware of already =)
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