You can check out the full notice below:
Dear Roku customer,
For products that support microphone access by channel applications, we updated our Roku device user interface to give you control over access by channel applications to the microphone on your microphone-supported Roku remote control and the microphone on your mobile phone via the Roku Mobile App.
From the Settings Menu of such Roku devices with voice-activated features (under Settings > Privacy > Microphone), you can revoke microphone permissions from individual channel applications. From the Settings Menu, you can also prohibit all channel applications from accessing the microphone.
For Roku TV Users:
More Ways to Watch is now a component of the Smart TV experience created for your Roku TV. To deliver a better Smart TV experience, Roku may use Automatic Content Recognition (ACR) and other technology to collect information about the movie or TV show you are watching (for example, program and channel names, time, date and duration) via your TV’s antenna and the devices connected to the TV’s inputs, including cable and satellite set top boxes. Roku also collects data about how you use the Smart Guide, a new electronic program guide that is available when you watch live TV.
As a result, you will no longer see “More Ways to Watch” in your Settings Menu. Instead, you will see “Smart TV experience” under “Privacy” in the Settings Menu. If you wish to enable or disable ACR on your Roku TV or the use of viewing information collected from your TV’s antenna and the devices connected to the TV’s inputs to enhance your TV viewing experience, go to Settings > Privacy > Smart TV experience > Use Info from TV Inputs.
These changes are effective on October 30, 2017.