Google's Nexus 4 was announced and launched last year in just a single color version - black. The white edition surfaced many times but it didn't go official until May this year. The Nexus 5 announcement will supposedly happen on October 28 side by side with the Android 4.4 KitKat premiere. We know all there is to know about the smartphone, but until know it has always leaked in black...
Source: http://www.gsmarena.com/white_nexus_5_leaks_via_an_official_render_image-news-7013.php