Next @xbox already being manufactured?

According to IGN, the next Xbox is already being produced! Apparently, the Austin, Texas branch of a company called Flextronics (which produced the xbox 360) has started the assembly line on the new xbox. Flextronics first had a test about what the product was going to be like and with that done the production started. With no word od Microsoft revealing anything at E3, news should come soon if they want to get a head start on marketing against Sony's next-gen console and the confirmed Wii U.