I emailed red box a few months ago and they informed me that after they did some more 16th century Europe/Turks (which seem to have been mostly completed) they were planning on releasing Japanese Artillery followed by Korean and Chinese Artillery as well as hinted at more sets in that theme. Now that the Japanese set has been revealed this seems to be true. I hope the Korean sets include a hwacha and a cavalry set and the Chinese need a complete overhaul.