Alex has said that he plans on postind on the forums an announcement about this, and it may be best to wait for that.  That said, between the fact that Google Drive has always had a 750GB per account per day upload limit (which is pretty low), some of the odd issues that pop up with it, and that they've recently limited to 1TB (or 5TB) of data and lock the account if it exceeds it (eg, stops uploads),  the writing has been on the wall for a while.