Android 4.4.4 KitKat has been released to Google's Nexus devices. For those who owns these Nexus devices should get a notification regarding a software update. The devices included on this rollout are the, Nexus 5, Nexus 7 (WiFi) 2013, nexus 10 (WiFi), Nexus 4, Nexus 3, Nexus 7 (WiFi) 2012, Nexus 7 (Mobile) 2012). If you own those and don't have the notification, you might want to manually check for yourself via the device's settings. Cheers!