The reason they didn't use the remixed theme for the mount, was because it doesn't fit the movement of it. Yes, they did say that if enough people wanted it in game, they might put it in somewhere, but it's not a priority. I think, when they stated that, they also said they would make a new theme for the magitek mount based off of the remix, but it would not be the same. This was in the live letter when the mount was presented, or in the one after, I forget. But it is somewhere. So we could end up getting the remix in the game, just not for the mount. And probably not for a couple of patches at least, as it would be a low priority item.