I feel bad saying it but the Nexus 4 feels like an "S" upgrade (like Apple's upgrades).
iPhone 4 - 4S added (if memory serves me from when I upgraded from 4 to 4S):
-Minor OS update
-Improved camera
-Improved processor
-Siri
-Pretty much same look
-Same storage
-No LTE
Galaxy Nexus - Nexus 4 added:
-Minor OS update
-Improved camera
-Improved processor
-Improved Google Now
-Pretty much same look
-Same storage
-No LTE
The Nexus 4's highlights seem to be:
-Price
-Photosphere (which outside of Google+ on PC isn't yet widely adopted)
-Quad-core
Whereas the cons (for many) are:
-Non-removable battery
-Only 8megapixel camera
-Back & front glass
-Still only 16GB storage
-No LTE
That said...I'm still ordering it next week, just seems like the Nexus S to Galaxy Nexus was a much bigger upgrade with less complaints than Galaxy Nexus to Nexus 4. I'm hoping Key Lime Pie comes by Summer 2013 but I think it won't until Nexus 5 (Fall 2013) to get the OS updates & release of new Nexus devices back in sync.
As a side-note I wish Google released a 399$ version of the Nexus 4 with global LTE, the 13megapixel camera of the Optimus G & 32GB storage...though that's likely a dream device that would all but kill competing Android devices so it won't happen.
Sent from my Galaxy Nexus using Android Central Forums