Wonder no more, it seems the next Kamen Rider series has been trademarked by Toei, and its name is Ghost!

Toei trademarked Kamen Rider Ghost (仮面ライダーゴースト) on April 28, 2015 according to the Ghouly News.

What does Kamen Rider Ghost entail? What will our titular hero look like? Nothing’s currently known beyond the name, but they will likely appear in the Summer Kamen Rider movie as is tradition.

h/t The Ghouly News