While it's quite possible Gandalf was telling Theoden about the Ringbearer's quest, it's also possible he was filling him in about Aragorn and Aragorn's return with Anduril. I don't think Hama had told Theoden of Aragorn's comment (cited above) and Aragorn hadn't yet revealed himself as Isildir's Heir to Sauron so it's at least possible that that was the surprise Gandalf was alluding to.
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Aure Entuluva!
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