Insiders in release preview ring are now receiving the Skype preview major update. The major update brings features like Skype-SMS integration and messaging everywhere to the Skype app on Windows 10.
Microsoft has earlier pushed this Skype update to insiders in fast ring. Release to RP ring indicates possibility of sooner release for everyone.
The update app version is 18.104.22.168. Once updated you will be prompted to use Skype for SMS.