We have updated HD art for Alpha, Beta, Unlimited, Revised, Alliances, Fallen Empires, and Antiquities! In addition, all Masterpieces (Zendikar Expeditions, Kaladesh Inventions, and Amonkhet Invocations) now have HD art. These should filter in without requiring a database update (though there may be a few lingering issues that get resolved as our server cache catches up).
We’re still working on Promos as well as pulling the rest of the Oracle database, which is taking a lot of time to get right. Thanks for your patience and we look forward to showing off some of the cool stuff we have in the works for 2018.