I think the Japanese language has more versions of the word "soon" that English just can't translate well. "Soon", at least how I understand the word, would have meant that the missing features (including the Course Creator) would have already arrived.
The first year mark for GT6 will be here in the coming months; and when that happens, "soon" has already been long past. So, maybe "soon" is just the closest English word for "will be here sometime in the foreseeable future before most people start showing something in the aging process".
At least that's one of my theories (guesses).