The role description for the manager's role says:

  Manager :
A Manager has all privileges at the project level like add new projects, folders, add/remove users and schedule meetings

The add new projects permissions scares me a little bit although its doesnt apply according to my tests.

So, will a manager be able to create or participate in any project available or he is just a manager to the assigned projects? If the second option is the one that applies, what does the add new project permission means?