Nexus 4 is all but vaporware
If Apple wanted to sell 1000 iPhone 5s for $100 and the rest through third parties for $600, that does not make it a $100 phone and it should not be reviewed as such.
Second, at some point the delay in making the phone available in quantity has a substantive impact as to how the phone should be rated in comparison to competitors. A three week delay-- no significant impact. A one year delay-- the phone is functionally obsolete. Skeptical though I am, I don't expect a one year delay, but even a much shorter delay could have a significant effect on how great a value proposition the phone is.
If the Nexus 4 is available in quantity before the return period for my One X+, I may yet get the Nexus 4, but right now I'm not counting on it.
More will be available, people just need to be patient. A sellout of this phone obviously means it is a success for Google.
Also, the nexus 7 preorders were handled awfully (just google "nexus 7 preorder fiasco"), so I understand why there is no preorder option.