Last we spoke of an app for Skype coming to Windows Phone was back in April, at MIX'11. An app was demoed and was slated for a "late fall 2011" release. Neil Stevens, Skype's Vice President and General Manager of Products and Marketing, spoke about how Skype is looking to be more integrated into the OS as opposed to being a mere app, which should be likely with Microsoft's acquisition.
We've now caught wind of Microsoft confirming the upcoming launch of a Skype app for Windows Phone, which is scheduled for late 2011. It will be interesting to see what the solution will be, we expect video calls will be supported to keep the app up to par with other platforms.