Something interesting is hiding in 10.5.3. I don't know what it is. I don't know what it does. But if it's necessary to upgrade if you want to use the new SDK release, that means that there's a something that ties 10.5.3 to new iPhone features.

So intrepid TUAW readers-slash-detectives, what can you find lurking in that new 10.5.3 firmware release that provides new and exciting iPhone functionality? Let us know in the comments.

My completely wild pulling-it-from-the-posterior guess is something to do with AppStore support -- or maybe the iNewton -- or maybe "back to my iPhone" support -- or... No really, I have no clue. Hopefully Uncle Steve will give us something nice for Keynotemas. Until then, see if you can figure it out.

This article was originally published on Tuaw.
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