"Hey Siri" support and possibly wireless charging case alongside AirPower charging mat.
AirPods and AirPower: Everything We Know
longer bars represent faster speeds
The new version of SquirrelFish is nearly twice as fast the first version of SquirrelFish which we previously reported on. It is also over three times faster then the current Safari 3.1 version that is available from Apple.
SquirrelFish Extreme is available in the nightly betas of Webkit for personal testing, and should eventually make its way into future Safari releases.