they're removing floor 2 and 3 of the PVP phantom school.
I'm not sure but here's how I think the phantom school works:
1. be lvl 90+ and talk to the ray guy at night to go to phantom school.
2. talk to shaman jia to get inside
3. either do 1 of 4 (or all 4, not sure on that wording) quests on floor 1
4. repeat for floor 2
5. repeat for floor 3
6. repeat for annex
7. kill mad ray
that gives you access to the phantom lab, which has the exchanger (that offers witch brooms), the compound stone changer (which will change compound stones to another of the same lvl, eg. change a lvl 95 MP stone into a lvl 95 HP stone), and the neo smelter which makes those region neo sets better.