Twidroyd, a popular twitter client for android, has two great features that I haven't seen in their competitor's clients. First is the live preview function which allows you to open web links seamlessly within the app without using the android browser. Second, would be how their navigation bar was at the bottom.
Because phone screens have been increasing in size having the navigation bar at the bottom had been a tremendous time saver. The most recent update moved it to the top, which has become an inconvenience for its users.
Hopefully they get an update out quick to allow the users to toggle the navigation bar between the top and bottom.