Get yo sim cutters ready, after the Moto X it looks like that the Nexus 5 will also have a nano sim. If Ukrainian carrier Life 
(no we didn’t add the smiley, it’s a part of the carriers name) is to be believed the Nexus 5 will be using a nano sim. Personally I find this unnecessary on Google’s part as to why a nano sim is necessary when a nano sim would have been good enough. Why make consumers go through the effort of getting a new sim and then getting it activated.
Source:-phonearena
Man, if this is true it really sucks. I dislike using adaptors.