So... aside from the story from the Ghostly Field Club, there are:
Oh my, I'll certainly look forward for those two.
Too bad there's nothing for PoFV, SWR, SA, TD, and DDC for now.
They could've go for the Sexagennially Empurpled Cherry Blossom, the Nawi Clan Ascension to Heaven, the Komeiji Sisters' Past (or the Underground Agreement), the Royal Clan Encounter with Kaku Seiga, and the Creation of the Shining Needle Castle. And there are lots other things to work on.
Touhou histories are all so delicious.
Also, what kind of support do they need?