This could be the additional BoatyBalls. Taken from BoatyBall website:

"First Come First Serve
FCFS mooring balls are coming later in 2019.

These mooring balls will be white with our orange logo. FCFS moorings are exactly that - If you tie up to the mooring first, it is your mooring for as long as you wish to stay on it. This is the traditional method used throughout the BVI’s. The only difference is you can pay for each nights stay via the App. No need to carry cash or wait on a tender to arrive to collect money for the mooring.

Tip & Precautions: Not all mooring balls in the BVI’s are in the BoatyBall program. The ones that are in the program are properly maintained by Moore Seacure. In most locations, there are several different owners to the balls located in the mooring field. Not all moorings are on maintenance contracts. So, if you are going to use the APP to pay for a BoatyBall mooring, please ensure that you are tied up to one, you have the right bay selected in the App (easy to do with the locate me button) and it is a BoatyBall mooring BEFORE you pay for it. Failure to do so can result in the loss of your payment. Paying for a FCFS ball before tying up to it, DOES NOT RESERVE THE BALL FOR YOU."