A bunch of people from LG went to the Google Mountain View offices to help design the Nexus 4 as far as I know, so it was mainly Google.
They did the same thing with Asus and the N7. That way the software guys and hardware guys are in the same location. I remember a good article on this, I'll see if I can find a link.
I read an interview with Google's lead designer on the N4. From what he said, it seemed that various manufacturers pitched ideas and technologies to Google, Google picked the one they liked best then worked with the manufacturer to finalise a design.
Google also seem to use one of the manufacturer's existing platforms as a basis for the various Nexuses (Nexii?) - HTC's Desire was basically the original Nexus, the next couple of Nexii (decided I like that one) were based on Galaxies and the current N4 is based on one of the existing LGs.
I read an interview with Google's lead designer on the N4. From what he said, it seemed that various manufacturers pitched ideas and technologies to Google, Google picked the one they liked best then worked with the manufacturer to finalise a design.
Google also seem to use one of the manufacturer's existing platforms as a basis for the various Nexuses (Nexii?) - HTC's Desire was basically the original Nexus, the next couple of Nexii (decided I like that one) were based on Galaxies and the current N4 is based on one of the existing LGs.
And the Nexus 7 was based on the Asus Eee Pad MeMO ME370T. Catchy name, eh?