Great @arfoll. Here you can download the test image for a RaspberryPi3. It is based on this github pull request. Be aware that the image will have no resinio configuration. So, in order to test it, you will need to download from the dashboard a configuration (see New feature: download configuration only) and inject it (copy it) in the root of the first partition (resin-boot) as a filename called config.json.
Thanks,
Andrei