As of now, data seems to be trickling into my own Google Postmaster Tools display, with some monitored domains showing current data (i.e. 2-3 days ago, as is standard in GPT).
The data is still spotty, though: some domain reputation listings show data points for each day while others show nothing between the 13th and now. IP reputation appears to still be missing for the outage period for the domains I’ve checked that are showing anything since June 13th.
Obviously the issue is not entirely resolved, but it’s nice to see something showing up after 2 weeks of dead silence.