Reports are the next films will be set 400 years before TPM
Yoda will be in them,…a good bit younger
Moderator Edit: the ‘High Republic Era’ has now been confirmed to be a publishing project (both books and comics - and was previously known as ‘Project Luminous’).
More information can be found at https://www.starwars.com/news/star-wars-the-high-republic
And also in V.I.N.Cent’s thread on it here:-
‘Star Wars: The High Republic’ era publishing project (aka ‘Project Luminous’) - in the ‘The Expanded Universe’ section of the site.