I doubt any of this is true. I would HATE if any of this were to happen.
Elongated screen: Hell no. Fragmentation, apps would look terrible sideways, games would have to be completely redesigned, and reason number one HOW ARE YOU SUPPOSED TO ACCESS NOTIFICATION CENTER WITH ONE HAND. The average thumb wouldn't be long enough to reach.
Flat back: No. I am over the flat back on the 4/4s. I prefer some sort of curve even if it's just on the edges (like the iPad).
Metal Strip: Ok I would prefer a metal back (liquidmetal), but a strip? At least in the mockup it looks hideous, but I'm sure Apple could make it look better. I know Apple may not be able to make the entire back metal for reception purposes, but we'll see
Thinner: Honestly, I would prefer a bigger battery to thinner
new dock connecter: oh great!! So every dock connector that people have been collecting for over a decade have suddenly become worthless! Why? To make the hole slightly smaller... so what? if anything it's better wider because it gives more support.
lame, lame, lame, LAME!