Android on Chrome OS: Shipping to Release Channel
In other words, the first few Chrome OS end users are starting to get access to Android apps, probably including yours.
The release announcement phrases it as “This build includes the Google Play Store (beta)”. It is unclear if they consider Android on Chrome OS to be in beta, or just the Play Store. Regardless, users might be given a bit of warning that this is very new tech.
The documentation regarding Android on Chrome OS has moved into the standard Android developer site. If you have not done so already, plan out what you are going to do, particularly with respect to testing, so see how your app behaves when running on a Chromebook rather than on a traditional Android device.