"Hey Siri" support and possibly wireless charging case alongside AirPower charging mat.
AirPods and AirPower: Everything We Know
Apple Helping Developers Finalize Apple Watch Apps at Cupertino Headquarters
"The developers invited by Apple to Cupertino range from those behind titles for sports applications and productivity software. Apple has also been meeting with banks to work on WatchKit applications that assist with the Apple Watch’s Apple Pay functionality. Besides U.S.-based banks, Apple has been working on WatchKit apps with developers from Germany-based banks, which indicates Apple is likely in talks with more foreign banks to expand Apple Pay to more countries across the world."MacRumors reported a few weeks ago that some developers have been asked to have Apple Watch apps readied by this month, although this report claims that Apple seems to be operating on a more urgent timeline, possibly in order to ensure that some apps are finalized for an upcoming marketing initiative or media event. In the meantime, Apple has reportedly been holding workshops to train retail employees about the Apple Watch in Los Angeles, Cupertino, Austin and Atlanta.
Apple CEO Tim Cook confirmed the Apple Watch will launch in April.