I must have been actually working last month because I haven't heard about the entanglement-enhanced microscope. Does it do fluorescence microscopy? The was no mention of fluorescence in the article. It sounds like this is just better DIC imaging, which is of limited use in biology. Electron microscopy has (literally) been around since before the internet and has better resolution than anything you're going to get with light. Light microscopy seems to be primarily important today for basic stuff like whole tissue imaging (generally not requiring the resolution described here) or fluorescence microscopy, which it doesn't sound like this microscope can do. Fluorescence is useful because with most applications, you're trying to visualize a small thing in a much much much bigger volume of stuff. Like you're trying to see a protein within a cell within a tissue. Looking at cells with light for a small thing doesn't tell you much, you just see a blur. When the small thing is basically emitting it's own light, as happens sorta with fluorescence, you can see it.
There are also already fluorescence based microscopy techniques which surpass the diffraction limit.
I'm not going to say it doesn't sound useful, since most of the time, you only realize how useful a thing is once you already have it. I'll just say that if the microscope mentioned here doesn't do fluorescence, I can't think of anything one would use it for that they wouldn't be able to do better with EM or fluorescence microscopy.