I can now confirm via multiple sources (Thank you all!) that:
- The Tamron 70-180mm f/2.8 USA preorders will open on May 14. Looks like preorders in Japan will open earlier.
- USA price will be $1199
This means the price of the Tamron is 46% of what you pay for the Sony 70-200mm f/2.8 GM lens :) And we know from the first review (read here) that the Tamron has super optical quality. So yes, I am pretty sure this is a Killer lens!
UPDATE: The preorders in Japan might start next week according to Nokishita:
タムロンの「70-180mm F/2.8 Di III VXD」は国内でも来週中には予約開始されるらしい。#噂
— 軒下デジカメ情報局 (@nokishita_c) April 3, 2020