All you can do is go to the FCC TV Query Database, look for those stations in the geographic area of concern with a license status of "CP" (construction permit). That's your best indication what will be turning on in the near(ish) future.
Thank you Henry that is what I was looking for. And I bookmarked the link.
I selected construction permits under record types and I entered the coordinates and a 100km radius and it came up with 0 TV records. So it looks like they will be fine at least for a while when I set them up.
I did find a pending application –
WEDY-DR CT NEW HAVEN USA APP
Petitioner: -
Service Designation: DR Petition for rulemaking to add or modify a digital allotment (see Docket for details)
Transmit Channel: 41 632 - 638 MHz Application
Virtual Channel: (viewer sees this channel number)
Network affiliation: -
File No.: BPRM-20090713ABS Facility ID number: 181052
CDBS Application ID No.: 1323075
That station is showing up already in the lookup in Shures WWB.