Don't worry, this is still the same Foundation, so you won't have to change your workflow. If you downloaded the static CSS version, everything will work in exactly the same way. If you installed Foundation using the gem, there will be a couple of adjustments that you'll want to make to your markup and SCSS before you get going. These changes are fully documented in both our Foundation Docs and the newfangled Right-to-Left Foundation Playground page.
Oh yes, we added the full documentation for right-to-left support in the 4.1 release, so it's super easy to get your setup instructions from the Foundation Docs.