Looks like they are taking another stab at the treasure chest thing again - players can now open a "new" Gold Treasure Chest for 9 reward points.
It seems like almost everyone is getting 10 reward points for opening their chest at a cost of 9 reward points. In other words, players are getting 1 free reward point for participating in this feature.
For now, enjoy the free reward point. However, when I think about the true motives behind this recolored treasure chest, I keep thinking about this achievement: