Questions about Philips 65pus6521/12

I could never really solve the problem between the TV and the Heos Soundbar. Now I have switched to Sonos Playbar and never had a problem again. It seems that Heos and Philips don't really get along. But have now become a Sonos fan anyway.

Yes, it is built directly into the TV, you have a menu item Ambilight + Hue...

Yes, that's possible.

According to the packaging, the technical description by Philips and the super-sharp visual image perception, it must be assumed that it is HDMI 2.0! ;-) For a good result, an HDMI high speed cable is necessary.

If you believe the internet, HDR is supported: http://4kfilme.de/philips-4k-android-fernseher-2016/ This is also stated in the specifications, here at Digitec. The test reports for the product point to other models and HDR is not yet supported on those. Unfortunately, I can't provide any further information about Netflix, as I don't use it.

No, unfortunately that wall mount doesn't support the VESA Standard 400 x 200 which your TV has.