Neither dark matter nor dark energy are new physics. We don't know exactly what particle or combination of particles is responsible for dark matter, but there's not yet evidence that dark matter actually is composed of something outside the standard model. Dark energy is, despite the name, well explained by general relativity. When people talk about new physics, they're referring to things that change our understanding of how the universe works on a fundamental level. By comparison to biology, these are like newly discovered species - of course they're interesting but our understanding of nature is unchallenged.