You don't get to be CEO of a major oil company by being a shrinking violet. I had left the organization before Tillerson took over but I worked for a major oil company for 20 years and I can guess what may soon take place soon at the Department of State. Tillerson rose through an organization that routinely fired the bottom 10% of their staff based on their performance reviews and I expect Tillerson will bring this same results focused business approach to State.
Tillerson's focus as CEO of ExxonMobil was results, schedule and cost. I doubt that that will change. State employees should expect to held responsible for results and should have their resume ready if they do not achieve them. They can also expect to see some changes made. It won't be business as usual.
I point to the following excerpt from Tillerson's speech to State Department Employees with key statements highlighted for emphasis: