Yes, you read it right. 4.4.4 is now live for all Nexus devices. Either wait for your device to get the update or download the rom and binaries yourself via Googles factory download site. BTW, if your phone/tablet is running fine on 4.4.3, I wouldn't bother updating. If you are having issues like battery drain, def update. I don't have the changelog for 4.4.4, but it is likely a small patch for bugs and/or stopped/restarted Dalvik runtime. Just my guess.