All the Google Chrome branches can be downloaded from Softpedia
The Development branch of Google Chrome, a browser built on the Blink layout engine that aims to be minimalistic and versatile at the same time, is now at version 38.0.2107.3 for Linux, Windows, and Mac OS X.Google Chrome usually features three distinct branches: Dev, Beta, and Stable. The development branch is where all the new features, changes, and other improvements are made, so it’s no wonder that a new version has popped up so quickly after the previous one.
Despite the small build number increment, the actual changes for this new release are impressive, although nothing major really stands out. For example, a new Blink version has been implemented, support has been added for loading pak files from arbitrary file regions, more policy UMA metrics have been added, the V8 engine has been updated, the scroll slop area is at least as large as it is by default on Windows, and Linux users should now be able to move the cursor for 130 pixels before it snaps back.
The Google Chrome developers only provide two kinds of binary files, deb and rpm, and no source. If you are not using a Linux distribution capable of reading this type of files, you will have to wait until it hits your repositories.
Usually, a complete list of changes can be found on the official website.
Download Google Chrome 38.0.2107.3 for Linux
Download Google Chrome 38.0.2107.3 for Windows
Download Google Chrome 38.0.2107.3 for Mac OS X
Remember that this is a development version and it should NOT be installed on production machines. It is intended for testing purposes only.