The long-awaited Skype Linux update fixes navigation issues and bugs from the earlier release. There's also better support for logging into Microsoft Accounts as well as optimized voice messaging.
The new features to the Skype for Linux 4.2 release include opening an account link to your logged-in account, a subscription status and link to the account view from the main window, improvements to multi-monitor sharing, and other mostly small and uninteresting new "features" to the proprietary program. There's more in the way of bug-fixes for this Skype Linux update than actual new features.
More information on the new release of Skype for Linux can be found out from the Skype blog.