We've released the 20190625 SDE at https://evekit-sde.orbital.enterprises/20190625/api/ws/v20190625/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.
IMPORTANT: the volumes table (invVolumes) is not quite correct in this release. Steve's conversion failed to create this table properly and we haven't had time to fix it yet. Rather than delay the release, we decided to push the 20190625 release using the invVolumes table from the 20190529 release. We will post again once we have this table fixed.