Volkswagen AG, the German auto group, is expected make an announcement to employees as soon as today that outlines clearer guidelines for whistleblowers to come forward with information about the emissions-cheating scandal, a person familiar with the situation said. The announcement is expected to include a deadline of the end of November for employees to provide self-incriminating information with impunity, as Volkswagen's management responds to pressure from regulatory agencies, especially the U.S. Environmental Protection Agency, to deliver a more detailed explanation of how Volkswagen came to cheat on emissions tests and who was responsible.