"Hey Siri" support and possibly wireless charging case alongside AirPower charging mat.
AirPods and AirPower: Everything We Know
5G iPods, PowerBook Updates?
Regarding iPods, ThinkSecret mentions that upcoming Mini models could hit 5GB capacities, meanwhile the 5th Generation iPod, due in mid 2005 at the earliest, may move away from the white form factor to "a more silver enclosure".
PowerBook supplies have widely been reported to be constrained... but ThinkSecret feels that PowerBook announcements will be made soon -- possibly on Jan 25th or Feb 2nd. The site reiterates their previous predictions of 1.5/1.67 GHz models.