Looks like I might have to eat my words in thinking that the recent Apple TV price drop wasn't a sign a new model was coming sooner than later.
As for the new Apple TV box itself, expect an updated design and new innards: the company’s latest A8 system-on-chip — or a variant of it: a dramatic increase in on-board storage to accommodate app — well beyond the 8GB in the current device; and an improved operating system that will support Siri voice control of Apple TV, and enable it remotely for a selection of Homekit-enabled home automation devices...
Via Daring Fireball.