Dojo 2 has been in the works for quite some time. It is finally at a stage where most of the packages are in either alpha or beta and can be tested.
You can find more information about the status of each Dojo 2 package here .
SitePen has put a lot of work into making Dojo2 stable and powerful for developers. Dojo2 is all written in TypeScript . SitePen has also been very active in the TypeScript community and providing feedback on features and capabilities. The Definitive TypeScript Guide is still a go-to reference for anyone working with the TypeScript. There is a neat blog post here on multi-platform distribution with TypeScript.
Hit me up with any questions, thanks!