From most of the information I've read that is currently available on this technology, it focuses on searcher intent.
The idea is that when people enter queries into Google, Google will make all sorts of predictions as to what those queries really mean and what the probabilities are regarding potential answers.
Using this information, then Google rearranges rankings based on heading, information, and the following paragraph that is supposed to answer the heading.
If anything, this is a golden opportunity because I see a lot of older churn-and-burn, automatically written or machine-written garbage dropping off the SERPs, if not being banned outright.
This is a step in the right direction for people looking to deliver exactly the kind of value looked for by people searching for certain terms on Google.
If you think about it, it's good news.
The key is to format your content correctly.
This also involves reexamining how you create content in the first place.
Gone are the days of people just coming up with a keyword and then spamming the keyword many times in the body of the content.
Gone are the days where people just scrape all sorts of incoherent garbage and mention the keyword a strategic amount of times.
Google's MUM will be a game-changer because it is intended to push online publishers to create content that benefits flesh-and-blood human beings, not SEO robots.