The interfaces for ITemporaryTopic and ITemporaryQueue extend the IDestination interface instead of their respective ITopic and IQueue interfaces. The types are Topics and Queue, they just represent temporary versions. The QueueBrowser functionality should be able to operate on either but would require additional create methods just to support temp queues, or they'd have to specify the more generic IDestination interface as their destination parameter which isn't as descriptive.
The Temporary destinations should also add the Delete method like the one's in the JMS spec have defined. Clients can throw an Unsupported exception if no able to delete them.