Normally, when it comes to Nexus devices you have to wait a while before any official accessories are made available in the Google Play Store, and this time around Google and LG still haven't quite gotten it right when it comes to the Nexus 5. This time around there are a bunch of cases and covers listed for your brand new Google flagship device, but you can't buy any...
Source: http://www.phonearena.com/news/Google-has-a-bunch-of-Nexus-5-cases-listed-but-not-available_id48937
Source: http://www.phonearena.com/news/Google-has-a-bunch-of-Nexus-5-cases-listed-but-not-available_id48937