Important Change: Fix importing a dump from a MySQL 5.7 server 8.0 failure.
  (ER_WRONG_VALUE_FOR_VAR, when an unsupported [by 8.0] SQL mode was used).
  The behavior of the server in such circumstances now depends on the setting of the
  `pseudo_slave_mode` system variable.
  If this is false, the server rejects the mode setting with ER_UNSUPPORTED_SQL_MODE.
  Otherwise, server just gives a warning. (Bug #90337, Bug #27828236).

InnoDB: Properly initialize the static thread-local 'tables' variable in
  the TempTable storage engine (on Solaris X86) was not properly initialized.
  (Bug #28987365)

InnoDB: Fix incorrect lock order caused a deadlock when one thread attempted to
  drop a table while another created an encrypted tablespace. (Bug #28774259)

https://dev.mysql.com/doc/relnotes/mysql/8.0/en/news-8-0-14.html