Videos and photos of T-14 - Russia's supertank have been taken at a base for the first time. This tank is supposed to have a particularly advanced defense system, that interferes with the guidance of modern ATGMs, leading them to miss their target. It remains to be seen if the Russians will actually sent some into Ukraine for testing and whether or not the technology actually works. More or less than 100 have been produced in early production runs.
This would also be the first war where a next-generation tank would be used. The US is still using the dated Abrams, and the Abrams X is more of an prototype rather than a production model.