Back in July creator of Scala, Martin Odersky at Scala Days took us on a Scala 3 tour, highlighting some of his favourite features. If you haven't seen it already this is not to be missed and if you have it is definitely worth another watch...
A Tour of Scala 3
This talk was given just as Scala 3 was shaping up and it went into feature freeze shortly after, late in 2019.
About Martin Odersky
Martin Odersky is the inventor of the Scala language, a professor at EPFL in Lausanne, Switzerland, and a founder of Lightbend. His work concentrates on the fusion of functional and object-oriented programming. He believes the two paradigms are two sides of the same coin, to be unified as much as possible. To prove this, he has worked on a number of language designs, from Pizza to GJ to Functional Nets.
He has also influenced the development of Java as a co-designer of Java generics and as the original author of the current javac reference compiler.