Another suggestion. I've noted that a lot of complaining has gone on in other games about how the level of magic in many of these games has little to no effect on the world in the game, or some level of discontinuity, despite it being powerful and everpresent, or being overly expected in an environment where magic isn't very powerful or common. I recommend giving careful consideration to how much influence the amount of magic you plan to have in the game would realistically have on the world in that game. From what I've seen discussed, I guess this would include inventions and the expectations, attitudes and perceptions of NPC's and characters alike.

A thought to encourage your project's success.