The newly released images are actually a couple of weeks old, but it doesn't much matter for our purposes. Curiosity is now rolling on lighter-toned, harder ground on which its tracks aren't easily visible anyhow. But for the first 100 or so Sols (that's a Martian day) Curiosity was making serious tracks. In the image above, Bradbury Landing is basically the dark smudge at left. The tracks weave across the lower half of the image over to the boundary where you can see the terrain changing. That's where the rover is now, and it's here we lose visual on the tracks.