This update BRICKED my iPod 6G. I've had various iDevices for over 10 years, first time I've had this happen. Will try again later in case the problem is on their end. In the meantime, not updating my others. The OTA update was 1.2 GB, so I decided to use iTunes. In hindsight probably not the right decision...
[update]
Was eventually able to get the iPod to come to life and update properly. I will spare you readers the details but it did involve multiple DFU mode attempts, deleting and re-downloading the .ipws file, multiple restarts of iTunes, reboots of my PC, etc... It did end up being a full restore, but iTunes had made a backup as part of the initial update attempt so no data or apps lost. Just my time...
Late this afternoon I then moved on to two other iDevices and those updated without incident.