Improved start-up time
We have improved the start-up experience by optimizing the loading of the application. This should give a notable gain to the start-up experience when using faster devices.
In-app notifications of app updates
You will now receive a reminder within the app when a new version of Skype is available for your device, simplifying the upgrade process.
Instant Messaging user interface improved
We have implemented a more compact view so that you can view more messages on the screen. In addition, there are changes to the color scheme and to some of the notification messages.
Video rotation supported on most devices now
Video rotation is a feature that ensures that the video on your device will display correctly regardless of
the orientation in which you hold your device. We have improved our video engine’s support for video rotation based on how you hold your device, which now covers most devices in the market.
via: Google Play