Futo and Kogasa, but no Miko? Seems suspect to me.
I can't think of a number but, for who would particularly stand out to me as choices to make interesting fighters or obvious choices-
Returning cast- Reimu, Marisa, Cirno, Sakuya, Alice, Youmu, Yukari (w/ Shikigami summons?), Suika, Reisen, Aya, Komachi, Sanae, Utsuho
New characters- Nitori, Yuugi, Koishi, Ichirin and Unzan, Byakuren, Seiga and Yoshika, Miko w/Futo and Tojiko summons, Mamizou, Kasen, RANDOM YAMAME
I really can't help but think what a neat character Ichirin could be, same with Nitori and her go-go gadget copter/whatever. I'm happy with whatever cast we get though.