A promotional video of Skype for iPad leaked when a Skype employee mistakenly posted it on the company’s YouTube account

A promotional video for Skype’s long-awaited iPad app has leaked on YouTube. Posted accidentally, the video was supposed to be kept private until the app officially launched in the iTunes App Store next Tuesday.

The video demos the application’s video chat capabilities, which rival that of Apple’s built-in FaceTime service with a window for both the person you’re chatting with, and one to view yourself in. The video also shows Skpe dialing and chat.

Skype’s has had an application available for the iPhone since 2009, though it only added two-way video calling a few months back. An iPad app though only seemed like a natural step.

Overall, the big difference from Apple’s FaceTime service is that Skype’s application brings video chat over 3G networks. FaceTime currently only works over Wi-Fi, something Apple it will change. They just aren’t really sure when.

Additionally, Skype’s iPad application brings video chat to owners of the first-generation Apple tablet. Apple does not allow FaceTime currently on the iPad 1.

Anyway, to take a look at what Skype for iPad will look like, take a look at the leaked promo below! Pretty awesome stuff.