Since this is a flash based MMORPG its unique in not only its great design, but also in the fact that it can potentially be played on multiple platforms.
One of the things I've heard multiple times from WOW players was their frustration that they couldn't play or do anything on their mobile devices with WOW. This weekend I got my HTC EVO and since it has Android 2.2 it can play Flash 10.1. I figured I'd give the game a shot on my 3g wireless service since I can play other games using it. Alas, it took too long to load and finally errored out. I'll try again on my wifi next test but figured that if your not thinking of it yet, it would be great to have it. In the coming year 4g is coming to my area so maybe that will work as well.
But I'm sure since you are world builders your already on top of it. Keep it up ladies and gents, looks great so far!