The latest update supports the new Nexus devices, ahead of their availability
Chrome for Android isn't really keeping up with the regular Chrome, it's still a few versions behind, but at least it's getting updated.The latest is Chrome 18.0.1025464 for ARM devices and 18.0.1026320 for x86 devices, which would be the Motorola RAZR i and a couple of Chinese phones.
The update is a minor one, bugs have been fixed and lingering issues resolved, you won't notice anything new but Chrome should feel more solid.
If one particular bug has been annoying you, you can check out to see whether it's been fixed.
The only big news in this latest release is support of Google's newest devices, the Nexus 4 and the Nexus 10.
Since neither is selling just yet, they'll start shipping on November 13, by the time most people get their hands on the new phone or tablet, Chrome should be ready for them in the Play Store.