I have tried the unplug/replug recommendation and the popup screen no longer appears. However, when the Roku main screen comes on, that is frozen and the control paddle will not work. Every time now that I want to use Roku (I have a Roku 3), I have to unplug, wait and plug in the unit in order to be able to use the system.
I believe you just have to use the arrow keys (right and down) to either accept or decline the new features tour. However, for those that experienced issues, simply unplugging the device's power will force a reboot of the Roku and should remove this notification screen.
Roku Community Streaming Expert Just another Roku user... I am not a Roku employee. Insignia RokuTV, Ultra 4660x, Premiere+ 3921, Express 4k+ 3941