Previously, you could only add passes if the company supported it. So most airlines have Apple Wallet passes, but most gyms don’t. This update will allow you to create your own passes. Basically just storing the QR codes (and maybe some metadata?) in one easy-to-use place on your phone. I can imagine this being convenient for daily use so you don’t have to track a gym tag with a QR code and a library tag with a QR code, etc. Also nice for tickets to events.