So guys... I have some potential bad news.
A recent trailer () has been uploaded on the the japanese pokemon YT channel and featured various clips (and some unseen clips) including one of Eevee being scanned in the Dex, unfortunately, when Eevee was scanned in the dex, it was seen that only 8 empty pokeballs were show (the blank pokeballs indicate evolution) and Eevee has 8 evolutions, with Sylveon being the latest one.
There is the picture, sucks that Eevee may not get an evolution this gen):
A recent trailer () has been uploaded on the the japanese pokemon YT channel and featured various clips (and some unseen clips) including one of Eevee being scanned in the Dex, unfortunately, when Eevee was scanned in the dex, it was seen that only 8 empty pokeballs were show (the blank pokeballs indicate evolution) and Eevee has 8 evolutions, with Sylveon being the latest one.

There is the picture, sucks that Eevee may not get an evolution this gen):