Specifically, the update brings the version number to 3.10.651.09 and the change notes state that it offers a fix for a "MMS over LTE issue". There's no word on how large the download is but we would expect it to be pretty small. Sprint previously released an update for the HTC 8XT in December that upgraded the OS from Windows Phone 8 to Windows Phone 8.1.
Source: Sprint; Thanks to John for the tip!
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