One thing I haven't seen much written about is the addition of Bluetooth 5.0 to iPhone 8 and iPhone X. According to the Bluetooth standards commission, the big change with version 5.0 is increased range. (The last few updates have focused on reduced battery usage.) With Bluetooth 5.0, the range is now supposed to be up to 800 feet (240 meters).
Bluetooth 5.0 also has increased bandwidth, allowing you to have a Bluetooth connection to two devices at one time. In theory you'd be able to send your music to two different Bluetooth speakers or two sets of headphones.
To me, however, the biggest deal is the increased range. Hopefully that translates to the Apple Watch and AirPods. I'm looking forward to testing this out when I get my new iPhone X.