Yes, Apple sells individual Siri Remotes for $79. Alternatively, if you have gaming in mind, you can purchase the SteelSeries Nimbus Wireless Gaming Controller for $49.95. The Apple TV will support two Bluetooth controllers in addition to the Siri Remote.
Apple TV 4G
Now that the voice-activated Siri personal assistant has been integrated into Apple TV, many users are wondering exactly what questions Siri is capable of answering. Searching Apple TV is the tip of the iceberg, as the Siri Remote will answer a long list of questions like the following:
No, audio is delivered via HDMI on the new Apple TV. Previous models had Optical Audio out, but there is no Optical Audio port on the Apple TV fourth generation.
The Apple TV 4G has improved sound output over the old Apple TV, upgrading from Dolby digital 5.1 to Dolby Digital Plus 7.1. The Dolby 7.1 audio is delivered over an HDMI 1.4 port directly to a television or monitor.
Yes, the standard aluminum Apple TV remote works with the fourth generation Apple TV.
The Apple TV 4G includes an infrared (IR) sensor that works with the old Apple TV remote. This means the new Apple TV works with both the Siri Remote via Bluetooth 4.0 and the traditional remote control with IR.