Today HCL released FP1 for the actual Domino Server 12.0.1 and also for Notes 12.0.1.
All included fixes can be found on the official Fix List site: https://ds-infolib.hcltechsw.com/ldd/fixlist.nsf/Public?OpenView&Start=1&Count=30&Expand=1#1
Here´s the link to the System Requirements:
HCL Notes 12.0.1 Fix Pack 1 System Requirements
HCL Domino 12.0.1 Fix Pack 1 System Requirements
12.0.1 FP1 for Domino and Notes is already available on HCL Flexnet.