Sony has a treat in store for PlayStation Portable (PSP) fans, but the electronics giant’s keeping the surprise's full details firmly under wraps for now.

Eric Lempel, director of PlayStation Network Operations, has written on the official PlayStation blog that a firmware update “will be released soon” for the handheld console. It’ll be called version 4.05.

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So far he’s only said that “this update will add new visualizers for music playback”, because Sony claims that many users are listening to music on the PSP.

However, Lempel added that the latest firmware will bring other new features to the PSP – but he wasn’t willing to give away any further details.

Hopefully the update won’t cause any PS3-style firmware problems though…