As we brace ourselves for the upcoming WWDC iPhone hardware, 2.0 firmware and App Store announcements this week, it might be a good idea to warm up with a confirmed software announcement.

Last night, Sling Media, purveyor of an Internet-streaming peripheral called the Slingbox, announced its official development of an iPhone client. Dubbed SlingPlayer Mobile, the client will allow Slingbox owners to stream any video from their TV input over the Internet to their iPhone.

Ars Technica reports that SlingPlayer Mobile won’t be ready for release at the WWDC tomorrow, but the company has been testing the waters with both the iPhone SDK and a jailbroken phone.