By Jim Karpen
While tvOS for the fourth-generation Apple TV didn't get a major update, it received some really welcome new features. Apple said there are now over 6,000 apps for the device, and announced some major new additions. Sling TV, the $20 per month streaming service that offers ESPN and about 20 other major channels, is now available for the Apple TV. Also coming is a sports app from Fox that lets you watch four screens at the same time.