From the stream:
"Lone Wolf is available from level one. You can pick it at character creation. It doubles all the points that you invest in attributes and skills. The limitation is that you can travel alone or with one companion. This means that you can still play with your buddy or with one companion to enjoy the full benefits of Lone Wolf. If you hire someone else the bonuses will be temporarily muted."
That should answer all the questions above. Any further questions about it can be answered in less than 12 hours :p
