Another rewrite? Yeah.
Discover Killer 3.0 removes Snapshot, but replaces it with the ability to use custom overlays. These include a simple RSS feed, Google's Entertainment Space (which shows movies, TV shows, games, music and books), or HomeFeeder. See the Wiki page for more info.
There's also a rewritten settings UI which is simpler, and has much less wait time as the preview has gone. Instead, the overlay changes immediately, so simply swipe to go home to view the updated overlay.
Please note: If you're updating from an old version, please uninstall it before installing this new build. You will need to re-hook the Google App (and Entertainment Space if you have it installed), and then reboot for it to take effect.