In addition to the X900F series that Sony unveiled at CES 2018, this iconic Japanese brand also announced the X850F series. Both feature Google Assistant support and have been listed already on Amazon at prices that range between US$1,499 and US$3,999.
https://www.notebookcheck.net/Google-Assistant-coming-to-Sony-smart-TVs.281922.0.html
The X850F does not use a OLED panel. The A8F does.
It's a X900F with an older X1 chip that won't support Dolby Vision.
Edited, thank you very much for clearing that out.