143 panos total, 28 on the Youtube slideshow.
Direct link for April 8, 2018.
Playlist for all the featured panos
The images are available for purchase here until April 13, 2018.
A free, full-resolution sample can be downloaded from here.
If you have Google Cardboard remember to try out the Viewer App to access the featured panos.
Click and drag in the pic above to look around.