Here are Android 4.4's Main Features
- The voice-activated always-on search assistant was first seen in the Moto X, Android 4.4 extends it to the Nexus 5, allowing users to just say "OK Google" when in the home screen to launch the Google Now assistant and do a voice search, send a text, get directions or even play a song.
- Google Now can be launched by simply swiping to the left instead of swiping from the bottom, at least on the Nexus 5.
- Enhanced Google Now with new card types that bring information about contextual topics that interest users such as updates from a favorite website or blog.
- Users will now be able to print photos, documents, and web pages from their phone or tablet through any printer connected to Google Cloud Print, HP ePrint printers, and via other printers that have apps in the Google Play Store