9.3-beta postgres-fdw COPY error

Greetings,
I'm trying to test out the new postgres-fdw support in postgresql-9.3
(beta) in preparation for an upgrade from 9.2 later this year.  So
far, everything is working ok, however one problem I'm encountering is
with the COPY command. When I run it against a foreign table (which is
also in a 9.3 instance), it fails:

COPY my_foreigntbl (id,testname) TO '/tmp/testlist_aid' (DELIMITER ',');
ERROR:  cannot copy from foreign table "my_foreigntbl"


Is this expected behavior or a bug?

thanks!