I just bought a Bodyguardz Pure Glass screen protector. It does go all the way to the edges of the screen.
One problem with glass screen protectors that do go all the way to the edge of devices with curved screens is that the interference between the glass and the lips of some cases is too great.
I decided to opt to first protect the screen. I don't care what the screen is made from, that is a lot of real estate, making it the most vulnerable component of the N4 IMO. So I am going to make sure to protect that and then given the recent Samsung drop test results, I may not need much for a case after all.
I have an extra battery/charge kit coming and I am not going to want to wrestle much with a case to get the back cover off to replace the battery anyway. I am going to want something that I can get on and off quickly and easily.
I might try something soft and cushion like without much hard plastic going on....something that won't create too much of an interference fit issue with the screen protector. Either that, or maybe a UAG since they come with a screen protector and there may be enough room in there for my screen protector. I saw some Spigan videos for other Samsung phones that also had tempered glass screen protectors. There might be enough room in some of the Spegan's for my screen protector. I am going to want something if I can so that I won't have to worry about the camera lens being damaged. The N4 has a good camera...probably good enough to handle most of the shots I take now with a dedicated digital point and shoot that is getting long in the tooth. I would be thrilled with the idea of never having to buy another point and shoot. Funny how the smartphone business has had an impact on the camera and GPS business.
I do think the recent Samsung drop tests are very encouraging. None of the cases I would consider are going to give me much moisture protection.