Mostly by putting the pieces together. Questions have so far remained unanswered, which usually means any further information isn’t going to make players feel happy.
As much as is known, the next update concludes the PvP rework. If there is ever any mode within the next couple of years that allows VP to be lost, it will show up then. There’s only one VP pool, so your VP will drain away passively, even if you almost exclusively play Quick Battle.