The BC League announced that they formally approved Ibaraki as an official member during a representatives meeting on July 24. The new team will be called the Ibaraki Astro Planets and will join the league in 2019. Other details will be released at a later date.
The BC League is also considering the addition of associate member Shizuoka for the 2019 season. They are planning to make a decision before the end of August.
[UPDATE 8/29 @ 4:11pm]
The BC League decided to hold off on making Shizuoka an official member and will operate with eleven teams next year.
Source: Sanspo 8/28/2018