-1 from me for __package__, as setting that's the preferred way for directly executed scripts to fix their explicit relative imports (rather than trying to retroactively fix their spec). (https://docs.python.org/3/library/importlib.html also doesn't say anything about __package__ being deprecated)

I'd be OK with seeing __file__/__cached__/__loader__ get deprecated, but before they went away, I'd like to see "importlib.util.get_filename()", "importlib.util.get_cache_filename()", and "importlib.util.get_loader()"  helpers added.