DVC can move unreserved inventory to cash for breakage 60 days from check in.
They can also move it farther out based on trends. Trades out of DVC by owners can put rooms into the cash inventory at any time.
As far as DVC using their own points to reserve and offer for cash, via Disney, they follow the same rules as the rest of us and have to book using the same timeframe.
What rooms they choose to send to cash is completely up to them. If there are no bungalows showing for cash right now, then DVC has chosen to leave them for DVC members to book.
There is no set timeline when you might see them show up for cash but it will never be more than 11 months out.