so the WMC guide dictates what channels you can see? The channels were added on the 8th, maybe it will update tomorrow.
When I look at the diagnostics of the tuner it shows the new channels and doesnt have the deleted channels, so the cablecard must be up to date. I think it must be a WMC issue not getting the new lineup.
edit: I went to zap2it and they don't list the new channels, so that must be it. I hope they update it soon.