Personally, I would love if they introduced a taste of the Medieval to TS4, including a separate world that fits the criteria (older styled houses, dirt/cobblestone paths instead of roads, etc) so tha...
This is a great idea!! I loved medieval so much. I need to play again. I spent more time exploring individual careers over the storyline of my kingdom, but it was a lot of fun. I'd absolutely give away every cent I have for a medieval expansion. <3