The key point that you have to look at is; have you completed all of the recruiting process and just waiting for "the call", or are you still waiting on your interview results.
They won‘t tell you on Dec 31 that you‘re in, most likely they will all still be on Christmas block leave.
So expect a call before the Christmas break at the latest. Don‘t be afraid to call the CFRC that you‘re dealing with and be up front with them. Quite frankly this is your life/career that you‘re talking about, get answers when you need them. Don‘t wait for them to call you... When I was CTing over to the Regs, I would be in touch with my CT clerk every week to see what the status of my transer was.