Had the update too on my Sky 2tb and minis.
Saw this elsewhere for what has changed;
Fixes for this release Q003.001.45.00L (4lvm0pw) include;
- Addresses an issue affecting 1TB Sky Q boxes where no sound could be heard when connected to certain models of Samsung TV.
- Addresses an issue where the box may crash under certain situations when watching Online Videos.
- Resolves an issue when pairing a Sky Q Touch remote with a Q box where an on screen message would be displayed advising that pairing had been unsuccessful despite the pairing having completed successfully.
- Resolves an issue where a green screen is displayed when the Q box starts up.
- Resolves an issue where a Q box would switch in to standby randomly.
- Addresses certain situations which would cause a Sky Q Mini box to reboot.
- The Sky logo displayed in the bottom left of the Sky Q Guide had been updated to the new corporate style.
Powerline has been turned to On for the Sky 2tb boxes, but still set to off for the Mini.