We don't know much about these accessories yet - no price points, no release dates, etc. But at least I have some pictures to show you. ;-)
Update: This just in: Zune Home AV Pack (ERP $99.99); Zune Dock Pack (ERP $49.99); Zune Car Pack (ERP $79.99); Zune Cable Pack (ERP $39.99); Zune Premium Headphones (ERP $39.99); Zune Leather Case (ERP $49.99); Zune Sync Cable (ERP $19.99); Zune AC Adapter (ERP $29.99). All original accessories are compatible with the new Zune, and vice versa, all new accessories are compatible with the original Zune.