As we get closer to the rumored release date of the iPhone 5, yet another clue about its true nature has surfaced today.

Here's a new set of extrapolations, taken to a speculative conclusion by our friends at MacRumors.

When they snagged a couple of publicly available third-party cases that purport to fit the iPhone 5, they noticed that the case is so much wider that it strongly suggests a 4-inch screen on the new iPhone, larger than the iPhone 4's 3.5" display.

There’s another soft case with closed ends doing the rounds, also suggesting that the iPhone 5 will be significantly wider and thinner than its predecessor and pointing to the possibility of a 4-inch screen.

More from Mashable

Soft, big case: Meant for iPhone 5?

iPhone 5 to arrive in October: reports

MacRumors did more precise measurements with this particular case, noting that while the iPhone 4 is 2.31 inches wide, with its 3.5" screen measuring 1.95 inches wide, an iPhone fitting into this case would have a display measuring a significantly wider 2.24 inches. So if this indeed is the final case design, the iPhone will have a 4-inch screen.

However, given the secretive nature of Apple and the possibility of fake case specifications passed around to various manufacturers accused of leaks in the past, we can't be sure of the dimensions of the iPhone 5 just yet.

This is just one piece of info, but add this to all the other iPhone 5 clues, and most are pointing to the same thing: As the evidence mounts, it points to a wider, thinner iPhone 5 with a larger screen and tapered bottom.

I think the current iPhone's 3.5" screen is way too small, and I would like to see a display that's even larger than 4 inches. I think Apple will be enlarging the iPhone's screen, to match the larger screen sizes of many of its competitors. What do you think?

To be sure, we'll have to wait till later this month for the alleged introduction of the iPhone 5, with the rumored release in October.