Hopefully we're at the stage of the rumor cycle in which we begin to get photos, though it's quite early for that. Apple itself may not yet have decided what their next device will be. In any case, 9To5Mac has posted photos that appeared on the Chinese site CTech that purport to show the frame of the iPhone 6. In keeping with the rumors we've been hearing, the frame shows that the phone will be much larger than the current iPhone, and thinner. But as 9To5Mac notes, there's little to go on here, and there's no verification that these photos are authentic.
The rumors do continue to suggest that Apple will be coming out with a larger phone this fall. Most recently, it's been reported that the iPhone 6 will come in two sizes: 4.7 inches and 5.5 inches. The resolution would be 2,272 x 1,280, which would allow apps to easily be scaled up to the larger size.
So my take on it is that it seems pretty definite that Apple is experimenting with larger prototypes of the iPhone. And there's a good chance that we'll see a larger iPhone in the fall. But I'm guessing that it's way to early for Apple to have decided exactly what it's going to come out with.