Anyway, have you started the new event story? The one with the band has come a bit earlier than I expected (yesterday instead of late May), so at least we got something new to do. As for the Scarlet Devil Tower story, I was confused, and misunderstood. sodaodaoda more than likely referred to the 3 stages + story with the Witch of Scarlet Dreams. What I liked about that story is that it actually makes sense, and explains a little how you become able to access Alterisa as a friend. I wish more stories like these were made for the other SFES units, just that you could get a bit of connection and sense in regards to how you end up getting them besides meta reasons like "game wants new content to make money from". The story is simple, cute, and actually had quite a bit of fun when the two Marisa met (what do they do - let's have a demonstration fight to see how the other performs). As said, I really wanna see more of that in the future.
Also about the roadmap for Fantasy Rebirth, this is what we know as of now: