You beat me to it Chris. Just caught that. This has taken the place of 858.7875 as the primary "go to" frequency off the Voice Channel 860.7875. I wonder if this is an "add" or takes the place of 852.2625 which I never heard activity on!?!?
The switch was sometime around 9am. They said on B-PTL-1 that the 800 was out of service so I suspect more work was done than adding the one channel.
852.2625 would have been eliminated in the first part of rebanding (if it was even in use then). I have never seen it active on Unitrunker/TRUNK88 monitoring of the system over several years.