I think there was early talk of a March launch but it's been held up by the technical demands of getting the Ayr, Dundee and Aberdeen frequencies on air at the same time as launch. As an educated guess I would say May is the probable launch date.
I believe the channels were supposed to be on air by 2nd March 2017, but the document which stated that was lost in the revamp of the Ofcom website.
Obviously the launch has been postponed with agreement of Ofcom.
They will all have launch on or after the STV2 launch. They'd at least want Dundee and Aberdeen to launch at the same time, so that any publicity on STV News North would apply to both areas.
:-(
A former member
Interesting that stv2.tv was registered in 2007. Redirects to stv.tv currently.