The Canon EOS R3 has appeared for certification in Thailand along with some older Canon accessories. I’m not sure what the Speedlite 600EX II-RX is, as the Speedlite 600EX II-RT exists. There are a lot of older Canon accessories on the certification list below, so it’s probably much ado about nothing.
There is no new information to gather from this certification, but we’ll see the Canon EOS R3 officially announced in September.
Canon EOS R3 Specifications:
24mp backside illuminated image sensor
Multi-Controller & Smart Controller
Vari-Angle Touch Screen
NEW accessory shoe
High speed 30fps electronic shutter with AF/AE tracking + RAW shooting at this speed
AF down to -7.0 EV
8 Stops Coordinated Control IS with Optical IS and In-Body IS
4K Canon Log3
Internal RAW video...