The full-size scans from the Figure King hobby magazine that had the Starscream reveal.
It notes 2021 in one of the paragraphs, which is likely to be when it gets released. That doesn't give them much time to do up prototypes and production, but usually in the past, the concept images are only released after a prototype is produced to make sure it can work... so I expect a prototype revealed in the next few months, as they put it through its tests before production.
This is strange. The first images that were revealed the other day showed the book noting on its cover that this new Starscream is version 2, but the paragraph inside the book next to the Starscream image (was too small to read in the quoted link), notes "version 3"... so maybe the publisher got it wrong somewhere, and we still have no official word on what TakaraTomy are calling this toy.