Apple products are rarely sold below their suggested retail price unless it's to clear out inventory and Amazon usually marks products with a year designation when they are replaced with a more current model.
A new Apple TV has long been rumored. Most assume that Apple will replace the single-core A4 chip with the now nearly ubiquitous A5 chip. The dual-core processor would likely make the interface silky smooth and along with helping 1080p playback. Apple doesn't really have to update the Apple TV, though. The current model performs the current set of functions just fine. But a new model would hopefully bring a new feature set that requires a more powerful platform - like Siri on the iPhone 4s.
You can purchase the Apple TV for $89.99 from here.