The new privilege logic for CREATE TEMPORARY TABLES was merged into 10.0, but the test cases aren't there. There seem to be pieces in several test files, I checked grant2.test which contains a fragment for bug 27480 in MySQL 5.6.10, but not in 10.0.4 candidate.
http://bugs.mysql.com/bug.php?id=27480
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Bug
Major
Sergei, please review patch for this task.