Come on, really?
It's got a better processor, an LTE radio, a wayyyyy better camera, an SD card slot to add memory, a removable battery for those that care, and some pretty dam good screen technology along with Gorilla glass 3.
Seriously... It's a flag ship phone without the nonsense! How much do you think a phone of that nature should cost? $299-$349 like the nexus 4? It's impossible man, how can something that's better cost the same or less?
People have been whining for years that they want a true blue flag ship phone with stock Android! So Google is going to give the masses what they want and people are going to harp on the nexus 4 pricing? No can do my man! $649 is fine with me, I have no problem paying for what I've been wishing would happen for some time now.
Sure if you want the very best, you will pay for it. To me, the Nexus 4 is at the sweet spot for price and specs. For a upgrade, the GS4 is a great phone. But is it worth twice the price? To me, its definitely not twice the phone. I'll stick with my Nexus 4 for a while longer until something much more compelling is released No doubt, still an interesting move from Google.