According to Nokishita, the Europe price for Canon EOS R3 body will be €6,099 (Include VAT), and RF 100-400mm f/5.6-8 IS USM lens costs €749 (Include VAT), and RF 16mm f/2.8 STM lens costs €349 (Include VAT).
So we can expected US price for EOS R3 body will be lower than $6,000. Stay tuned for more info.