I've noticed over the years that DirecTV will randomly add some of the higher end channels as an unannounced free trial to a lower package. From what I can tell the system adds these at random. When I used to have Select I noticed that I had the following added as unannounced free trials
NFL Network
Esquire
FXX
Fox Sports 1
Logo
Cooking Channel
When I upgraded to Choice to get ESPN U for a college football game I still kept Esquire, FXX and Logo then a month later when I downgraded back to Select I lost access to NFL Network, Fox Sports 1, Logo and Cooking Channel. So if you have extra channels that your not supposed to have it is probably an unannounced free trial.
Oh and it looks like WGN America is now available in Choice and above. It was previously available in Xtra and above last year.