Nowadays Google will release new Android version after the Kitkat 4.4 version. It's called Android L.
Let's see the new version features;
A new User Interface;
Android L will be a new material design , material themes
New Widgets,
Other features, came with the 4.4 new Android Run Time (ART) instead of Dalvik.
ART is optional now in the 4.4. It's possitive effects battery life and performance.
Features;
Ahead-of-Time
(AOT) compilation
Improved
garbage collection (GC)
Improved
debugging support
Most Android
apps should just work without change under ART. However, some techniques that
work on Dalvik do not work on ART. For information about the most important
issues, see Verifying App Behavior on the Android Runtime (ART). Pay particular
attention if:
Your app uses
Java Native Interface (JNI) to run C/C++ code.
You use
development tools that generate non-standard code (such as some obfuscators).
You use
techniques that are incompatible with compacting garbage collection. (ART does
not currently implement compacting GC, but compacting GC is under development
in the Android Open-Source Project.)