So this release, beyond the usual bug and performance fixes, mainly makes official the group video chat we found a bit wonky in a real-world test—although Skype still labels the group video function as "beta." The Facebook integration, at least from the contacts-with-Skype perspective, is pretty convenient. Now you just have to bug your friends to list their Skype names on Facebook.
New also to this version is an automatic call recovery feature, which you can set to automatically re-dial and reconnect calls whenever they drop out. It won't be a great idea for every situation, but very handy in the right circumstance.
Skype 5 is a free download for Windows users only. Presumably, Skype will push out the group video features to other clients, as it's a Windows-only feature at the moment.