Just in time for the official start of the NCAA Tournament on Thursday, Comcast has added a load of new channels to its Xfinity TV offering, including options for watching the first second round upsets. Alongside March Madness viewing with access to TNT, TBS and truTV, key additions to the live-streaming library include AE, Bravo, Cooking Channel, E!, Food Network, HGTV, History, Syfy, USA and more.