Comcast Xfinity TV Player is now called Xfinity TV Go, and gives new live TV channels
Comcast has pushed a major update to their Xfinity TV app, and in addition to the premium channel streaming, they now offer live TV from different news, sports, and educational channels. Users on both Android phones and tablets can now tune in to channels from Fox, CNN, NBC, BBC and more while they are on Wifi.
If you're on Verizon, they have struck some deal where streaming is enabled on 3G and LTE as well. In any case, you'll need to be a Comcast subscriber to take advantage of any of this (or have a close friend who will share the login).
If you're a current user, or a Comcast subscriber who wants to give it a try (initial tests deliver a very nice stream on the Nat Geo channel) hit the Google Play link above.