I've been through this many times. It's been my experience that key people are brought in early on to assist with due diligence. Once there is an agreement in place and transition timelines are agreed to,, then details are shared more globally. Your questions will most likely be filtered through channels, first by supervisors and middle management. The answers will likely be broad at first because there will need to be a lot of planning involved and impact discussion. Depending on your level of responsibility, you will be brought into these discussions as needed. Uncertainty will continue for much of the transition as things get sorted out depending on how autonomous your company will remain and whether the merger was initiated and controlled by your company or will your company be merged into an existing company.