Hot on the heels of the first beta channel update, Google has released the first dev channel update for Chrome OS. If you've gone under Wrench -> About Chrome OS -> More Info and chosen the dev channel, you should see 0.10.142.3 being pushed out soon. Probably the most notable change is bringing the Chrome browser 10.x to Chrome OS where previously only the 8.x stable branch was available. Also, Chrome Instant is now available (see 2nd screenshot).
This is a major update so there's probably more. If you're updated to 0.10.142.3, keep an eye out for new features and be sure to let us know in the comments.