To give you heads up, we are currently doing some Sebilis and SolB tuning to smoother the progression from pre-raid Tier 2 to Tier 3, to address a tremendous difficulty jump between them. (basically this means, the mobs DPS should go down a bit, excluding top boss encounters)
At same time we thinking to Turn Plane of Valor into a 4th pre-raid tier by itself, perhaps complimented with a new alternative zone.