My QS8's shipped about two weeks ago, and they have the inserts. There is a black hex screw that needs to be removed to expose the mounting hole. It is threaded metal hole (1/4"-20) that goes deep into the speaker.

It looks like this is a new feature, since the rotating 360 degree view of the QS8 on the Axiom website doesn't show the insert.

Jason

M80 HP v4, VP160 v4, QS8 v1 (3 in 6.1 layout), SVS PB12-Plus/2, Parasound Halo A21, Denon AVR-X4100W