A couple of interesting Andrew Lloyd Webber interviews appeared today concerning Phantom 2. Neither of them mention any of the IDA girls by name, but there is some information on plans for rehearsals of Act Two and eventual hopes for the production.
Niamh Perry has previously stated publicly that she will be involved in the workshop for act two so I think we can surmise that some of the other girls will be attending as well. In the Playbill interview, Andrew reveals that there will be two workshops in October and December -- the first being for act two and the second for the full production. We'll be keeping a close eye on developments.
The first interview is with Playbill:
Second Interview from the Dean Piper site:
DEAN PIPER INTERVIEW