We've released the 20190911 SDE at https://evekit-sde.orbital.enterprises/20190911/api/ws/v20190911/swagger.json. You can access the SDE directly through that link, or go to the SDE section at https://evekit.orbital.enterprises.
If you're using the "latest" alias (https://evekit-sde.orbital.enterprises/latest/swagger.json) then you'll automatically be using the new SDE.