Until now, the new, private train operator has only run trains in and out of Madrid, and not even sold connecting tickets.
Starting next month they'll offer service linking the 2nd and 4th largest cities, without the train even passing through the capital.
The email I got is only in Spanish, and I can't find an English-language announcement online. Sharing it anyway...
https://view.e.iryo.eu/?qs=27aab31aaeea052bbc630d84bcea3296ce65f781af1d0ff511d270dc4e9728ef939ede1dbfe0b77c38f3631957441ee1920db88d0c73efe07170fcd79698a0d0b2b06f381b8f21158ab0ab6f5db063af