According to latest rumors, the upcoming Sony a7R V now rumored to be released in October/November 2022. This means announcement date for this camera could be as early as in August to September 2022. Currently, there is still no new specs about a7R V, you can take a look at previous rumored specs.
The Sony a7R IV is currently $500 off than regular US price at Amazon/B&H Photo Video/Adorama, you can take a look at more Amazon Prime Day Sony deals at Amazon.