Here's his email to me:
I have uploaded the USB Edition ISOs to the testing directory. This is so it will be available for some testing, before it is released in a few days.
I will pull the ISO if there is a serious bug, otherwise I will collect feedback, and make changes later.
To those who have subscriber access, and who can assist with testing, can you please download and give it a spin. Just use this thread for feedback. If you have any issues, we'll need to know which arch (32 or 64), your machine specs, and a brief description of the bug.
If you can participate it would be appreciated.