The demo here by Director of Windows Product Management Mike Bartlett demonstrates some of the new social features of the 4.0 beta. On the Skype blog Bartlett says this about the update,
"A while ago we realised we had outgrown our home. There was so much to pack in, and Skype got a bit crowded. We learnt that people new to Skype had so much choice, they didn't always know where to start or how to find things. So we decided to move into a bigger, better home. Skype 4.0 Beta 1 for Windows...
... So what's new then? We've given video calling the screen size it finally deserves, plus we've made it really simple to use. A single click on the Video call button and you'll be seeing and talking. Video doesn't start off really small anymore - it's big and beautiful to begin with. You can also resize and move your own video window around the screen quite easily. Plus in one click, you can have an IM conversation alongside the video call."
Skype 4.0 Beta - Advanced Demo
Another new feature is that it detects and remembers recommended hardware and troubleshoots problems related to headsets. I haven't had a chance to test it out yet but I've read some mixed reviews from people who love it and hate it and most objecting to the full screen video. Bartlett has been moderating the comments on the Skype and said,
"I assure all of you that we are listening, although it would be great if you could leave you feedback via http://www.skype.com/go/betafeedback - I assure you we will be making changes based on the feedback we receive."I keep in mind that that Skype is free and whether a Mac OS version is available in the future or not I'll keep on Skyping.