After a long delay, Sling Media’s SlingPlayer Mobile app for iPhone and iPod touch has been approved for release in the App Store, albeit with a very high price tag and more restrictions than originally planned. First unveiled in January, the approved app works only on Wi-Fi—not on 3G as planned, suggesting Apple and/or AT&T had issues with the bandwidth used by the app—and will support the SlingBox Pro, Pro-HD, and Solo,…