On monday, developers logged on to devices called the 'iPhone 6,1'. Normaly test machines are renamed with fake model names, however this one looked to be coming from the apple headquarters in California. This could be unreliable, however it is very probable that apple is already testing their new hardware. Check out this link to read the whole article.
http://www.washingtonpost.com/business/technology/apple-iphone-6-seen-in-testing-logs/2013/01/02/a1a92e3c-54da-11e2-8b9e-dd8773594efc_story.html