There is absolutely zero chance it will be called iPhone 6. It will be iPhone 5 or just "The New iPhone". Only total Apple geeks would think otherwise but here's the news - you aren't the target market for the iPhone, the target market is everyone with the funds to buy one and Apple won't want to confuse the general public. Nerd-raging that it should "technically" be called 6 won't change that.
I'd be willing to bet you anything you like that I'm right about this and you're wrong.
Just sayin'
Thank you, JimRod, for giving me the term "nerd-raging." I can't stop laughing!
That will be added to my vocabulary immediately.