Apple announced two Thunderbolt accessories for the new Macbook Air and Macbook Pro at the companies annual World Wide Developer Conference: The FireWire 800 and Gigabit Ethernet adapter. The MacBook Pro will have an SD Card, HDMI, USB2/3, MagSafe 2, and two Thunderbolt ports. Those Thunderbolt connections will need these adapters if you plan on using FireWire or Ethernet connections.
Apple is notorious for leaving behind what they consider to be outdated ports, so at least they are making an effort. The ethernet cable could be particularly useful when hunting for a faster connection speed.
