$450 to some people is actually a lot of money - and is classed as the high end range of smartphones. iPhone 4 is shocking with iOS7 so that's why their designing a lower cost iPhone - hell it might even only run iOS6.
Just because $450 is a lot of money to people it does NOT mean it is at the high end range of smart phones $450 would put it at the mid range ... the high end range is $600-700 as a start price. Models with more storage go up accordingly.
Also there is no way that they would release this phone with iOS6. One of Apple's call to arms has been that Android is fragmented by having users stuck on old operating systems. They would never, ever release a new product with an older version of iOS.
I think that this phone will likely start around $399 with a higher storage option at $499. On contract it would probably be either $0 or $49 for entry level and $99 for higher storage ... obviously just guessing, but the price points make sense and would fit into the existing product line up