“Replacing the lock icon with a neutral indicator prevents the misunderstanding that the lock icon is associated with the trustworthiness of a page, and emphasizes that security should be the default state in Chrome,” reads a Chromium blog post from the Chrome security team.

Source: Google will retire Chrome’s HTTPS padlock icon because no one knows what it means

I am dubious of this change because the new icon is even less clear. Why not just use a little gear icon?