So, somebody is already leaking Sword and Shield content, we have evolutions for Sobble and Grookey, and a final evolution on Grookey
https://www.youtube.com/watch?v=Awx4gifhUHU
EDIT: So with the confirmation of the three starter's final evolutions, I'm sadly gonna have to leave the Sobble Squad, as I just do not like the look of it's final evolution.