Ready for more iPhone 5 rumors? Of course you are! We've seen plenty of reports claim to have inside knowledge of what the next-gen iPhone will look like and today the folks at 9 to 5 Mac have thrown their hat into the ring. According to a source from Foxconn speaking to the site, mass production of the iPhone 5 is underway, which sounds reasonable since the device will likely arrive in June or July. As with most other rumors and leaks we've seen so far, this tipster says that Apple's next handset will retain much of the iPhone 4's design, save for two notable changes: a metal back that's similar to the original iPhone but flat like the iPhone 4, and a larger display. (Note: the image above is an iPhone 4 with an aftermarket "metal" back, not an iPhone 5)

There's also a rumor floating around from Cult of Mac claiming that an upcoming iPhone will pack NFC capabilities. Cult of Mac believes that Apple will introduce the feature to enable remote computing, allowing a handset to pair with a computer and load up a user's files, settings, apps, etc. This is similar to a rumor we reported on last year. Unfortunately, the site's tipster doesn't know when the feature will actually be introduced.

After hearing this rumor, some have voiced their concerns about a metal back, saying that it could cause some reception issues. If Apple retains the iPhone 4's antenna design, though, that shouldn't be a problem. There have been a lot of complaints about the iPhone 4's glass backing, especially in regard to how some third-party cases can scratch and even crack it, so a new metal rear could be a welcome change. Does a metal-backed iPhone 5 with a larger screen sound like something that you'd be interested in?

Via BGR, Cult of Mac, 9 to 5 Mac