Unlike Apple's iOS, which did not receive any interface changes until last year, Android is continually changing, with each major release refining its appearance and experience. According to the latest leaks, during the upcoming developer conference in San Francisco Google will announce a new version of Android that will bring many changes to the interface and functionality.
I will allow myself to start with new features as the interface overhaul we're hearing rumors about is controversial, to say the least. The details are sparse, but it is almost certain that Google's voice-based actions will be integrated deeper into the system and accessible from any place, including third-party apps.
Currently, if you want to ask Google a question, you need to slide your finger up from the bottom of the screen and open Search app. If the leaks are to be believed, in the next version of Android the gesture will be removed and replaced with a Google button, as you can see in the video below. And that button is what I am not particularly fond of, because it puts Google logo in the navigation bar, like coarse version of in-your-face marketing. If you own a phone with on-screen buttons, it will be always visible, no matter what app or service you will be using.
[video width="620" mp4="http://theultralinx.com/wp-content/uploads/2014/04/nexusae0_Share_Photo.mp4"][/video]
Also, since Google's apparent intention is to put their button in the middle of the navigation bar (basically making it the center of the phone), what will happen to the home button? All icons in the navigation bar are said to get a new cleaner look, but hopefully not at the cost of usability. It is possible that the home button will be replaced with a gesture or displayed in the 'Recents' list, but I believe many users would still want it to be available at their fingertips, as it is now.
Changes to the look and feel of Android are expected to include redesign of many first-party applications, such as Gmail, Calendar, and Dialer. Their interfaces will get more colorful and consistent, with slightly tweaked navigation controls and buttons.
As always with any rumours, take them with a pinch of salt. Whatever Google has in store for us, we will find out no sooner than at the end of June when the Google I/O developer conference will be held.
source: Android Police