When will the next iphone be announced/come out?

Also how much differences in specs can we expect? Will it feature quad core processor? Better graphics? Can we expect a completely different design(more than just a screen with a home button)? And other stuff. But when will it come out. Ill only get it (meaning ill get the 5 if it doesn't) if it has quad core like my current android

No one can answer this question properly but for the release date if i was a betting man i would say september/october for the next one.
But the spec and look of the phone is unknown so it is not even worth second guessing these i'm afraid.