It seems that Sony has already release the new Sony Alpha a7R III in China, here is the first unboxing video of new Sony a7R III, Sony a7R III is Sony’s first mirrorless camera made in China.
The US release date for Sony a7R III is at the end of this month. You can pre-order Sony a7R III at Amazon/B&H Photo Video/Adorama/Focus Camera. See also: Sony a7R III In Stock Tracker.