I'm gonna be honest, the silence is telling me Hina's probably gone at this point, or is at least heavily considering leaving. I feel like if she were planning to come back we'd have had some kind of update after the stream in October, even just a vague "thank you for your patience, Hina will be back when she's ready" thing.
It could be that they're trying to negotiate something and they're withholding comment until they know what's happening. The anniversary's on the 18th so they're gonna have to figure something out by then, or it'll be really, really awkward.