I'm probably jumping ship this year, not due to my iPhone 4S being outdated, rather due to it not working properly. Also, having used iOS devices since 4-5 years back, I have just gotten so bored with them. Moreover, iOS 6 was a complete joke, full of bugs. The 3GS was my best phone ever, but the 4S I cannot wait to get rid of. Ultimately, I would love to see Apple release a new iPhone, with a larger screen and completely revamped OS. However, it won't be happening.
Having said that I'm looking at either the GS4 or Xperia Z. I look forward to trying something new. Either of those 5" displays at Full HD will be quite an improvement from what I have now.
5 inch display is a big plus for me..need a far bigger screen than just a 4 like my iphone 5 has but everybody has different needs.