iFixIt has gotten hold of an iPhone 5 (which is on sale in Australia right now), and they’ve already cracked it open to reveal the innards. Shockingly, it’s composed of smartphones parts, including a screen, some chips, and the casing made of aluminum and glass.
In all seriousness, the 6th-generation iPhone does have some interesting changes. Of note, Apple has continued to make their designs harder to open by requiring screw-drivers that are more difficult to obtain. However, asiFixIt notes, the iPhone 5 is roughly as user serviceable as the 4S was, if one has the right tools. In fact, since the new iPhone is opened front-to-back (note: suction cup necessary), replacing a cracked screen is significantly easier on the new device than it has in the past.