Once the master CW feed was broadcast in 1080i this past June, the network is requiring their affiliates to also broadcast in HD.
See this section in Wikipedia.
My local affiliate is in 720p on a subchannel with our CBS station.
DircTV does have it in their data base for the AM21.
It doesn't say "requiring"... just "requesting."
When I contacted my local affiliate a few months ago, I was told they'd be offering HD in 2013. I intend on contacting them in a few weeks to see if I can get a better timeframe...
I cannot receive their signal OTA, so I'm totally dependent on DirecTV adding them in HD. With DirecTV FINALLY getting around to adding my local ABC in HD recently, my hope is that the local equipment has been upgraded to allow them to offer it as soon as it's available.
I will also continue to hold out hope that DirecTV will follow Comcast and offer CW HD VOD.