in first keynote of Google IO2012 Google announced new version of android OS series called jellybean, with some new features and some improved features what new in android 4.1 Google now ( update in real time ) new feature called ‘Google now ‘ will update in real time will let you inform about things those matter to you . it will update you about your favorite places and locations and everything you are interested on or which is belongs to you , from your office to home
smarter search results Google improved built-in search in JB ( jellybean)search smartly when you search for a person it will show you every single important related information about that person.
Resizable widgets one of notable improvements Google announced in jellybean is resizable widgets when u drag or pin any widget on home screen JB will automatically resize according to available space
offline voice typing now its possible to use voice to text offline , one of the major improvements in JB now you don’t have to worry about network when you are using voice to text and also Google improved accuracy
improved notification new notification area will show you more information than previous notification center ,e . g . now you can see not just missed call but time and contact name .
above are just few of changes and improvements of jellybean there are lot more . just wait for JB