I do try to keep watch on new games and stuff, and Sky Arena is among my top 3 list of things to wait (for updates, I already have the Hayate patch). Furthermore, the wiki tends to be quite updated very quickly. You can check that out for reference, but that may only comprise of like 20-50% of all Touhou based games or mods (there are many still not mentioned there, such as the EoSD 3D version)