Just got this from Support.
You can apply for the 4th Gen Apple TV app beta program here: Tablo 4th Generation - Apple TV Beta Team Signup Survey
App v. 1.6 and Firmware 2.2.54 seems to have fixed most issues. I have had an occaisional orientation to the correct day/time be off when I opened the app. I have seen that at times picture quality can be pixlated and in advertisements, some sound sync issues. This could be related to internet issues or wifi issues too. Not sure. The app is much improved since I last wrote.