This project is leaving a bit of a sour taste in my mouth, the more I read through it. It may just be because it is early days and I hope the criticisms/questions are taken constructively. Here are question to the OP:

- How are multiple environments managed, is my hard disk going to fill from multiple overlapping virtualenvs - How are resources managed for parallel runs, or is this offloaded to the cloud? - It lists Mac OS and Windows as supported platforms, are there plans for there to be a Linux version? (It is a bit surprising the Linux is omitted)