Underneath the apparently calm face that every major operator, equipment vendor and service supplier shows to the world, there is a sense that the US Pay TV market is once again entirely up for grabs and they are all positioning furiously. In the space of just a few days we have seen the first clarification that AT&T’s partnership with DirecTV, although initially focused on being big and looking for cost savings, it is also eventually about Mobile TV First – the term Faultline coined two years ago to describe a TV service attached to a mobile phone subscription, not a home. Also this week we have rumors of Apple dropping out of the OTT pay TV battle, after yet another…