I'm subscribed to Marques Brownlee on YouTube. I'm into tech and whatnot and I like the stuff he talks about. This video is a little old but in it, he has a dummy iPhone 6.
Now, I just want to say that it's not things like battery life, display resolution (which still isn't 1080p, but I guess you don't really need anything much higher than 720p on a display this small, but that's a discussion for later), screen size, clock speed, RAM, etc. that won't have me sold on this one.
It's that design.
This is possibly the ugliest iPhone I've ever seen. And I have to say that I really liked the designs of the iPhones 4 and 5. The square edges were pretty cool. It was hardware, specs, and iOS that kept me away from iPhones after I got rid of my iPod Touch. Especially iOS. I think iOS 4 was the last truly good version, but - again - different discussion for a later time.
In my opinion, pretty much every Android and Windows phone out there looks better than this. But hell, even if I did love the design of the phone, I'd still stay away from iPhones.
The phone I really want right now is the OnePlus One. Even though it doesn't have SD card support (which is something the Galaxy S5 has over pretty much everything - it can take up to 128 gigs of additional storage), the OnePlus One looks sexy, and it'll be something that pretty much nobody else has. I really hope I can find a way to get one at some point in time!