I don't know if they have a channel for HD just like Starz, HBO, CineMax, etc.
Because there is one in Comcast HD On Demand but it usually starts with a
Starz HD commercial but it has it's on Encore HD intro. Maybe just like HBO with
CineMax?

They used to, on Voom, but it was discontinued. For now, it's just VOD.

I, too, am waiting for the return of Encore HD. It went off the air 2 years ago.