@Verilian
Funny that you should mention Miku, because I've also started taking notice of Miku a lot more as well I think she has a reasonably good chance of getting into the new group!
Also, this might be a total coincidence... but Miku is appearing in a 4-person H!P Kenshuusei event along with Kirara, Nanami, and Kisaki next week.
It's the event in Nagoya that I mentioned a bit above.
Kirara and Nanami are debuting of course, and Ebata Kisaki is one of the most popular KSS with the Japanese fans and the KSS instructors (based on her results in Harodori). It might just be "Miku's turn" to appear in one of these events, but I feel like there might be some more reasoning to it.
Up Front sometimes hold these events in Nagoya where the members play a lot of games and hold a short live... and you get to know them a lot more. It's at one of these events in Nagoya where Rika got her nickname "Rikasama" from Keita, for example. These events unfortunately have never been on any DVDs or in any Harosute or Upcoming episodes, IIRC. The last event like this was over a year ago. Hopefully it gets streamed online like what they've been doing for birthday events recently, for all FC members (and others) to be able to see