I'm afraid I don't have a specific time frame for when the missing routes will be added. I don't like the results I've seen when I try to rush or force things, so a lot of things are unfortunately set to arrive "when they're ready". (For instance, Kiyomi's FN route was almost done when I realized how much I didn't like it, leading me to scrap it and start over.)
In the meantime, I suppose I should note which routes have been added to the game so far. Looking over the main page, it doesn't look very clear...