The coolest new Roku feature is Captions for Instant Replay. When activated, you press the replay button on the remote (looks like a counterclockwise circular arrow) and it takes you back several seconds and turns on text captioning for the duration of the replay. So if you missed a garbled mumbling from your favorite character, you can see it in the captions.
To activate, go to Settings > Captions > click on “Instant replay”.
The bummer: Doesn't work on Netflix.