How many seats in the bubble are left for online check in?

I travel to mco 14th October on VS027 was originally on the new airbus but have since found out we are back on a 747. I had seats pre allocated on the airbus but when the aircraft changed virgin did not change my seats over. I requested seats in the bubble but they are saying there are no more for pre allocation so they have put me in row 82 downstairs, my inbound flight i have nothing because there are no pre allocation seats left at all!!!!! What are my chances of getting seats in the bubble when i check in on line?

quite good I would have thought.

You should check a few hours before OLCI opens as sometime seats are released a little early and then do OLCI as soon as it opens to increase your chances further