Hmm, mixed feelings. It's a nice phone, and I have been waiting for fingerprint access since I sold my 5s. OIS is also nice, I hope it doesn't delay the shutter like anything else that is added to a camera these days does. I'm also immensely thankful that they ditched that AWFUL chrome surround on the N3 for a much more classy aluminum one, although I haven't seen what tone it will be on the black N4.
I'm bummed though that it's such an incremental upgrade. I wish they made it thinner and changed the design, as it is it looks freakin exactly like the N3, how am I supposed to Lord my N4 over everyone else?!~?!.
I'm intrigued by the Edge as well, not sure if it's a gimmick yet though. Since the SDK will be out there we can probably see some cool things with it soon. The Edge is slightly thinner, shorter and wider and that may actually be a good thing, not sure yet. The curved portion is meant to be always on, correct? If I have to press a button to activate it and check notifications then it's a complete and utter waste of a feature.
I also agree that they fubared by releasing it so late, Apple will steal their thunder. Honestly I'm a bit underwhelmed and would choose the iPhone 6 if all the rumors are true EXCEPT I'm completely addicted to the S-pen. That little S-pen is what allows me the freedom to leave my tablet at home and I don't think I'd give it up for anything, so more than likely N4 here I come.