As expected, Samsung has started rolling out Oreo Beta 4 build to eligible Galaxy S8/S8+ units. The update weighs in at around 850MB, and arrives as software version ZQL8 for both devices. As for changes, the update features improvements related to Bluetooth stability as well as a long list of bug fixes. The changelog also mentions new Google security patch - should be for the month of December, as Beta 3 included the November patch. Thanks for the tip, Pranjal!!!