I read or saw somewhere (can't remember where) that this next iPhone was SJ's "special project". And he devoted the entire last year of his life working on it. Even working on it the day before he passed. It was said that the next iPhone was going to be the biggest ever and the "wow" factor was going to be akin the original announcement of the 1st iPhone. I can't for the life of me remember where I read or saw it. It may have been on some TV show shortly after his death. I take all these rumors with a grain of salt but I'd like to think this was somewhat true. It was a great report.
It was an analyst that claims research turned up the Jobs + iPhone 5 rumor:
http://news.cnet.com/8301-13924_3-20120919-64/steve-jobs-last-big-project-the-next-iphone/
Might be true though:
http://gizmodo.com/5859076/did-steve-jobs-kill-the-true-iphone-5