That was my concern, as well. My display supports Dolby Vision, although my Sony UHD player currently does not, and it is unknown if Sony will provide a DV upgrade. Knowing the X3300 supports HDR10 now and would eventually get a Dolby Vision upgrade was good enough for me, since I will not need...
Just yesterday, I placed an order for a Denon AVR-X3300W to replace my 8 year old Pioneeer Elite 94TXH. Denon dropped the price on their 2016 models through the end of the month, which was the final thing that pushed me to order now versus waiting. Denon will be coming out with a firmware...