"Hey Siri" support and possibly wireless charging case alongside AirPower charging mat.
iTunes 6.0.5 Released, iPod Updater 2006-06-28
With iTunes 6, you can now preview, buy, and download music videos, short films, and hit TV programs on the iTunes Music Store and sync your music and purchased videos with iPod to enjoy on the go.
iTunes 6.0.5 allows you to sync your Nike + iPod workout data to nikeplus.com, where you can easily track your progress, set training goals, challenge others, and much more. Visit the Nike Sport Music area on the iTunes Music Store to download workout mixes, Athlete Inspiration playlists, Nike podcasts, and more.
Note: After purchasing music from the iTunes Music Store with iTunes 6 or later, you also need to upgrade your other computers that purchase music from the iTunes Music Store to the latest version of iTunes.
The download is also available from Apple's online iTunes download page.
Update - released alongside the iTunes 6.0.5 update is the iPod Updater 2006-06-28 for relevant iPods:
iPod Updater 2006-06-28 includes iPod Software 1.1.2 for iPod, iPod Software 1.2 for iPod nano, and iPod Software 1.1.4 for iPod shuffle. iPod Updater 2006-06-28 contains the same software versions as iPod Updater 2006-03-23 for all other iPod models.
What's new in iPod Updater 2006-06-28:
Nike + iPod support for iPod nano
Volume limit for iPod shuffle