Hello, jweaver0312. At this time we have no information regarding when a single sign on feature may be available through Apple iOS or tvOS. Thank you for your feedback. I'll pass along your feedback regarding this feature to our engineers.
The single sign on feature provided by Apple has been available since December of last year in iOS. Comcast has just refused to support it. It would be a great customer success to support this available feature in iOS.
Please pass my feedback also, I agree with the poster that we need this feature! Comcast is really behind on this now as Apple is now partnered up with over 400+ TV providers supporting SSO.
Its like everyones onboard but Comcast now, this includes its competitors like DirecTV and DISH...