It seems Apple is now negotiating with Time Warner to make HBO GO available on the Apple TV. 
If HBO GO arrives by mid 2013, its another selling point for the Aplle TV.
More here:
HBO Go on Apple TV? It could arrive this year — Tech News and Analysis
If HBO GO arrives by mid 2013, its another selling point for the Aplle TV.
More here:
HBO Go on Apple TV? It could arrive this year — Tech News and Analysis