The NBC game broadcast is basically split by conference. Cities in the WC will see Colorado/Dallas, those in the EC will watch Rangers/Devils in high defintion. Right now Centerl Ice also lists both games of those games too.
If you don't live in an NHL city, I am not sure what game will be broadcast in your area. I haven't tracked down a coverage map, but will post it if I see one. added 9:30am, coverage map now located....and it shows a different breakdown of what I originally posted...
The other Center Ice game listed for today is Montreal/Carolina.
There is some talk the Flyers/Sabres game on OLN will be in HD. The official OLN schedule does not show that but if it is, we may be searching for the HD channel because in my area (Detroit), the HD channel for OLN games was INHD(2), but no NHL on those channels listed for 7:00pm.