(android 4.4 is optimized for improving the performance on devices with 512 MB RAM or less.The entire UI is going to get smoother.)
1.UI improvement and redesign in apps-the apps like email and downloads are streamlined.the status and navigation bars go translucent.
2.improvement in google now-google now is 25% more accurate and will give u precise results with ur questions.cards for local shopping have been added.
3.SMS app is a part of hangouts-with hangouts u get three options- SMSs, MMSs and GTalk chats.emoji icons are incorporated in stock keyboard.
4.CALLER ID gets smarter-priority will be given to contacts with whom u talk the most.local listing on google maps will be used for recognizing numbers.
5.quickoffice default app for document reading and editing-quickoffice is integrated with android 4.4 just as iWork suite in apple devices.
6.voice control is always on-android kitkat incorporates always-on voice control that allows users to send text messages, locate places on google maps, play songs.
7.SCREEN RECORDER-u get to record anything u do on ur phone and save it in mp4 format.it is very useful for creating tutorials.
8.addition for support of cloud printing-the new version of android adds support for cloud printing.the limitation is that google cloud Print function is limited to the HP ePrint range and printers that have apps in the play store marketplace.
9.step counting-fitness freaks rejoice! Android 4.4 comes with a function called Moves that operates as a pedometer that counts your steps. google says this is a battery friendly way to measure your daily activity level.