New Skype UI is not as intuitive as I thought. And I hate its new copy message feature. Why the hell you keep adding user name and posted time in the copied message for me. Fortunately, I found that this feature (big flaw, from my point of view) can be turned off in the options.
Also, now it has a new window style that aligns conversation window to the user list. By this way, user only has to deal with one window at a time. You can switch to other conversations by selecting from the current ongoing conversation list.
The wierd thing is: I can't find documents or any help files that describe all these changes... Are they expecting every user knows how to use these strange UI once they get the updates?