Damnit I'm late again
IT'S HERE.
She's one cute little butterfly :3
Chances are that she's the first boss, since her design and her pose look really light-hearted. I'm sure looking forward to her theme now :derp:
Now I'm thinking what name ZUN might've given her. Wriggle is the first insect character in Touhou and has a Western name. According to cuc's insight though, this new character probably has got an Asian/a Japanese name, since her species is likely from the East. Then again, Doremy is based on a Japanese mythological creature and has a Western name, so no one can know for sure what naming shenanigans ZUN's up to again.
Wild speculations ahoy!