According to Kyodo News (via Sanspo), the Premier 12 is slated to take place in Taiwan and Japan. Official announcements are expected to be made by World Baseball Softball Confederation President Riccardo Fraccari in Tokyo on the 19th and Taiwan on the 20th.
A different Kyodo News (via Nikkei Shimbun) report notes that Fraccari is scheduled to arrive in Japan on the 18th to discuss the possible return of baseball/softball to the Olympics with the Tokyo Organising Committee of the Olympic and Paralympic Games President Yoshiro Mori. The two will meet on the 21st. Fraccari could also meet Japanese Olympic Committee President Tsunekazu Takeda.