I tested 3 games.
Final Fantasy XV: 7.1 channels in LPCM. 5.1 channels in Bitstreaming. Full use of all channels including the center.
Order 1886: 7.1 channels in LPCM. 5.1 channels in bitstreaming. Majority of the mix is in the front L/R speakers with occasional/directional sounds out into the surrounds. No use of the center channel whatsoever.
Middle Earth: Shadows of Mordor. 7.1 channels in LPCM. 5.1 channels bitstreaming. No sound coming from the center channel but makes full use of the surround channels. Heavy use even. Surround content us quite robust. Subtle sounds are shunted to the mini-speaker in the DS4 controller (!!) But are also subtly presented through the surrounds as well giving one the sense that while you hear it coming from right in front of you (the controller) it also sounds like it is coming from everywhere at once, but in a very subtle manner. EXCELLENT use of surround channels.
Stand tall and shake the heavens...