If you’ll notice, the stair-car also has a link to VOTeBLUTH.com, though the website doesn’t appear to be active just yet.
The link will presumably feature themed promotion around Lindsay Bluth’s bid for Congress, as was established in the final episodes of Season 4.
Given the surprise release of Season 4’s remixed “Fateful Consequences,” it makes sense that Netflix wouldn’t wait long to announce and premiere the first traditionally-shot Arrested Development season since the original 2006 ending.