TokuDB status variables are missing from Percona Server 5.7.10-rc1

TokuDB status variables are missing from Percona Server 5.7.10-rc1

mysql> show status like '%oku%';

For 5.7 it's:

Empty set (0.01 sec)

For 5.6 it's:
...
264 rows in set (0.00 sec)

Show plugins on 5.7 shows that TokuDB is installed and activated:

| TokuDB | ACTIVE | STORAGE ENGINE | ha_tokudb.so | GPL |
| TokuDB_file_map | ACTIVE | INFORMATION SCHEMA | ha_tokudb.so | GPL |
| TokuDB_fractal_tree_info | ACTIVE | INFORMATION SCHEMA | ha_tokudb.so | GPL |
| TokuDB_fractal_tree_block_map | ACTIVE | INFORMATION SCHEMA | ha_tokudb.so | GPL |
| TokuDB_trx | ACTIVE | INFORMATION SCHEMA | ha_tokudb.so | GPL |
| TokuDB_locks | ACTIVE | INFORMATION SCHEMA | ha_tokudb.so | GPL |
| TokuDB_lock_waits | ACTIVE | INFORMATION SCHEMA | ha_tokudb.so | GPL |
| TokuDB_background_job_status | ACTIVE | INFORMATION SCHEMA | ha_tokudb.so | GPL |
+-------------------------------+----------+--------------------+----------------+---------+