I hope the actual product ends up being similar to that mock-up.
I've bought a new iPhone every 2 years starting with the 3GS, and never used any of them with a case until the iPhone 6. The rounded sides were just too slippery, it was the only time I ever dropped one of my phones. (The phone developed 'touch disease' after that happened, and after I got it replaced under AppleCare I've used super thin 'skin' cases just to make it more grippy)
If they go back to flat edges, I won't need a case anymore. The 4 was my favorite design overall, the glass on the back was relatively scratch and stuff resistant. I did like the rumor about ceramic from last year, I'd be okay with that for the back too.
I've bought a new iPhone every 2 years starting with the 3GS, and never used any of them with a case until the iPhone 6. The rounded sides were just too slippery, it was the only time I ever dropped one of my phones. (The phone developed 'touch disease' after that happened, and after I got it replaced under AppleCare I've used super thin 'skin' cases just to make it more grippy)
If they go back to flat edges, I won't need a case anymore. The 4 was my favorite design overall, the glass on the back was relatively scratch and stuff resistant. I did like the rumor about ceramic from last year, I'd be okay with that for the back too.