"This news may sting a little for some of you early Slingbox adopters. The recently announced, but not yet available SlingPlayer Mobile for the iPhone will require new hardware. Sling Media's site specifically lists the Slingbox SOLO, Slingbox PRO, and the Slingbox PRO-HD as the only compatible devices.
To ease the pain, Sling Media is offering a $50 discount to owners of the original Slingbox, Slingbox AV, or Slingbox TUNER. If you intended on upgrading anyway, this is actually turns out to be an awesome deal."