A while ago Ben announced that they were going to make a new website, this would have the forums on it, they also mentioned this on their square space website and on twitter. This was shortly before they went silent.
I bet they will come when the new website is up. That is probably what they are waiting for.
Well we have already had a bb gold update out, and they didn't come one.
So I think if they have secretly been working on a bbo update, they might come on.
Otherwise I think they might not ever come on, the longer they leave it, the more questions and anger we get so the more scared of coming back they will get.
And the less chance of a return.
They won't come on if they release a minor update, only if something big happens.
If we leave messages on the BB twitter feed saying visit the forums, they might come on as they usually reply to their twitter. Alternatively it could go very wrong and they could stop using their twitter as well as the forums.