It doesn't take long after a release for the first rumors of the next version to begin circulating, and in the case of the iPad Mini, it took less than two weeks. In an article citing the Chinese-language Commercial Times, Digitimes reported on the possibility of an iPhone 5S and an iPad Mini with a Retina Display coming in early 2013.
But Digitimes track record suggests this just isn't the case. Known for reporting on anything that passes by their desk, Digitimes has an accuracy rating that would have a hard time overcoming a broken clock, so this one should be taken with a giant grain of salt.
Apple recently suffered a small customer backlash by releasing the iPad 4 so soon after the iPad 3, a move that may have been based on moving the iPad lineup to a holiday release schedule. Without a pressing reason, Apple is unlikely to make the same customer-unfriendly move so soon. And at the very least, we'll need a better source than Digitimes to take such reports seriously.