Jolla has made Sailfish OS available for Nexus 4 smart phone. In case you want to give it a shot take a look at this site:
http://jollasuomi.fi/sailfish-nyt-asennettavissa-android-laitteille/ . Scroll down and you'll find some english as well. Please keep in mind that Sailfish OS for Nexus 4 in NOT fully working yet. There are issues you should take into consideration!