"Hey Siri" support and possibly wireless charging case alongside AirPower charging mat.
AirPods and AirPower: Everything We Know
IBM Announces New Chip Making Method
The new manufacturing process for the new chips includes silicon-on-insulator, strained silicon and copper wiring based on a 90nm chip making process. The resulting chip "which can process vast amounts of computer memory compared with a standard 32-bit chip, can either run at faster speeds or use less power".
According to Richard Doherty, research director at Envisioneering, "It's logical that Apple would select the flexibility of this chip for a next-generation notebook computer."
The incorporation of both Silicon-on-insulator and strained silicon gives credence to this early rumor report which claimed that IBM was producing chips using a new SSOI (strained silicon on insulator) manufacturing process. Previous expectations had targeted this technology at a later date (2005).
The new chips are already being used in the Xserve G5s. More information should become available at the ISSCC 2004 conference this next week.
Meanwhile, CNet report echos a previous expectation of 2.5GHz speeds, but may simply be based on the same Microprocessor Report speculation published earlier this week.