Reports have been posted on Radio Reference about a new VHF trunking control channel being heard in the San Francisco Bay area of Northern California. Best guesses are that the control channel is coming from Mt. Tamalpais, a popular radio repeater site.
Here is the system information so far:
173.7875 MHz
P-25 Phase 2
System ID: 4D5
RFSS: 003
Site ID: 067
WACN: BEE00
The system is now in their database:
https://www.radioreference.com/apps/db/?sid=10459
Since no traffic or talk groups have yet been seen active, the system may or may not be actually using P-25 Phase 2 voice.
Speculation abounds as to who this system is being built for. One poster mentioned he had knowledge of a "new federal system for Bay area coverage", but no speculation on agency or agencies.