Usually, there are more parts to the NOTAM than this, I usually see something like CAT I-E is now I-B...
These are the Special Authorization SAAR CAT I and CAT II's, for autolands and HUD, which this appears to relate to.
CAT I 200' DA, 1800 RVR FD with coupler or HUD to DA
CAT I 150' DA, 1400 RVR HUD to DA
CAT II 100'DA, 1000 RVR HUD or autoland
CAT II 100' DA, 1200 RVR HUD or autoland