In an investors note this morning, Jefferies analyst Peter Misek says Apple is planning to release the iPhone 5S in June of 2013, reports Business Insider.
Misek is predicting the iPhone 5S has a new "super HD camera/screen, a better battery, and NFC," and "possible updates include an IGZO screen for Retina+, 128GB storage." He's also predicting it comes in 6-8 colors, presumably similar to the iPod Touch which comes in a bunch of colors.
Apple has released its last two iPhone models in the fall; however, the iPhone 3G and iPhone 4 did come out mid-year.
Misek's report appears to corroborate another from DigiTimes which said the iPhone 5S will enter volume production in the first quarter of 2013.