Here are two reasons why I may want an iPhone with a 5.5" screen:
- Optical image stabilization for 5.5" iPhone only: KGI Securities says the 5.5" iPhone is likely to have optical image stabilization while the 4.7" iPhone may not. Optical image stabilization is what gives point-and-shoot cameras the ability to shoot clear photos even if your hand is not completely still. Since I'm really into iPhone photography, this is a big deal for me.
- 5.5" iPhone could have better battery life than the 4.7": Photos of a 2,915 mAh battery for the 5.5" iPhone has surfaced. Compare this with a possible 1,810-2,100 mAh battery for the 4.7" iPhone. Both batteries are an improvement from the iPhone 5s 1,560 mAh battery and the iPhone 5 1,440 mAh battery.
For me, battery life and picture quality are high on my lists of wants for the new iPhone. If I have to buy the insanely larger iPhone, then I'll do it to get those feature. I hope Apple takes advantage of the larger screen real estate to create a new class of apps that'll work with special features on the 5.5" iPhone, not unlike the iPad-only apps.