Apparently not, though I have done so in the past on PostgreSQL 9.4. It appears to be related to the "schema" with which the foreign table is associated:
I installed the newly released PostgreSQL 9.5 this morning and compiled the latest mysql_fdw extension from EnterpriseDB. I was able to create the SERVER and USER MAPPING, but I cannot seem to get IMPORT FOREIGN SCHEMA to do anything. The command executes without error, but none of the table schemas are imported from the MySQL DB. Does anyone have any advice, links, documentation which might be of help?