Google had originally pegged December 2010 for the first release of Chrome OS. But, developers continue to work on tablet-friendly features. Two code revisions have landed in past couple of days with "device orientation support (think auto-rotating content on your Chrome OS tablet and accelerometer-enabled games) and speech input" features on the table. Both features have been part of Chromium code for a while now, but they're now enabled by default. It's also worth noting that voice input support is only on by default for Chromium's Windows users -- Mac and Linux users would need to add the --enable-speech-input switch to their shortcut.
Developer Jeremy Selier has posted a demo video of device orientation using his Macbook Pro: