With the push to HTTPS for communities, this one is going to become quite a big issue for workflow with the SDK.
Any progress or updates a workaround?
As it stands just now no browsers will load the CSS from the local machine if you're viewing the environment using a HTTPS connection.
I've spun up Apache on my dev machine and configured a virtual host with self-signed SSL certs pointing to the .tmp/lia directory, the problem with this is that only the CSS file is compiled, the assets from /html/assets/ server side don't get downloaded to the .tmp/lia/<skin>/html/assets directory when navigating around the staging environment leaving elements of pages not displaying properly.