The Dev Channel for Chrome OS has another incremental update rolling out this morning. The update is still in the Chrome 65 train and updates the build to version 65.0.3325.9 (Platform version: 10323.1.0). If you have a device in the Dev Channel, you can type chrome://help to check for the update an install it.
As I pointed out last week with the first Chrome 65 build for Chrome OS, the Dev Channel is not aimed to be used in production. It is an alpha level build of the platform aimed at developers. It almost certainly will have show stopping bugs and issues as the Chromium team within Google and developers hone the build to get it ready for Beta then production.
This update is a bug fix build for the channel and you can expect to see another update or two prior to the build hitting the beta channel. Once Google feels it is ready for the beta channel, it will replace the current Chrome 64 build that sits in that channel now.
Generally the channels for Chrome OS are incremented each month on average. Currently Chrome 63 is the production (Stable) channel with Chrome 64 in the beta and Chrome 65 in the Dev.