The short answer is: not that much is new, no major adjustments. In some important ways, the report is a disappointment. Bear with me.
H2: shrewd operators using DM to confuse the adversary, knowing by mid-September that a counterintelligence investigation is under way
H3: a bit of H1 and H2.
First, the Mueller report does not mention Cambridge Analytica. No surprise, really. The Cambridge Analytica story was and is perhaps the single most vacuous and over-hyped tech-story I can recall. At least one of them.