iPhone 4S
Loads of people having a sulk about no iPhone 5 today. Get over it.
The iPhone 4 is one of the best designed phones, ever. Ever held one in your hand? Seen the display? Rock in the faster processor, bombed-out camera and some more software trickery, you've got a powerhouse for all your fave iOS apps. I for one am pleased, my accessories will still fit the new iPhone 4S (Glif stand, olloclip 3-in-one lens, etc) Will I upgrade to 4S? Maybe, maybe not, I usually skip the 2nd gen models (I'm a first gen kinda guy).