Beta or prerelease software is not intended for inexperienced users, as the software may contain bugs or may potentially damage your system. We strongly recommend that users exercise caution and save all mission-critical data before installing or using this software.
From Skype:
The beta version of Skype for Ubuntu (64-bit) comes with extra features and better sound and video quality. This release comes with high quality video and super wideband audio that have been exciting features of Windows and Mac versions, so now the special people in your world will feel much closer and clearer on your Skype calls.