Nothing has been changed. The RNG is distributing the available roles and who is assigned which. That has always been the case. Scrolls are doing the rest.
Disclaimer: I try to abide by the game's softfilter and use the appropriate replacements, when I am using the forums. Those will be set in brackets. Example: [tarnation] Visit my role suggestions and give me feedback: http://www.blankmediagames.com/phpbb/viewtopic.php?f=27&t=28949
Visit the Testing Grounds Occupation: A developers pain and joy (QA-fox), currently "hired" by Ralozey