Link or are you guessing?
I saw it on the TV guide last night.
If you have the new DirecTV receiver and remote, press the Menu and scroll through the options to select 'Search for Shows and Schedules' (or something along that line), when you click that, choose to search by the show's title. Type in Walking Dead and the list of shows will come up on the right side of the screen as Walking Dead, The. There will be two showings: Both repeats of the first episode, one on AMC and the other on IFC.
IFC shows things unedited, all the time, no matter how explicit it may be. Maybe the violence was an issue after all? I don't have concrete evidence about a possible channel move, but it is kind of odd that the show starts to air on a mature station after only a week.