Samsung has dropped Samsung Wallet into the Play Store, an app previously only available through Samsung Apps on devices such as the Galaxy S4, Note 2, and Galaxy S3. We first heard about the offering back at this year's Mobile World Congress, and its functionality hasn't changed from what was promised. This remains Samsung's answer to Apple's Passbook, just easier to find than before.
The app functions like a digital wallet, holding coupons, tickets, and gift cards from select partners. This won't replace physical wallets though, as it's not integrated with an actual payment system, nor is there NFC integration in anyway.
Passbook is one of the few features on iOS that I feel a bit envious of (even if it doesn't do payments like Google Wallet). Apparently Samsung had similar thoughts when it was announced, because the company unveiled a brand-new in-house platform this morning called Samsung Wallet that does basically the exact same thing.
Samsung didn't provide a launch time frame for the service, but we're guessing this was just a taste of the new software features we'll be seeing in the Galaxy S IV announcement on March 14th.
Wallet works quite similarly to Apple's Passbook platform, in that Samsung has announced a number of launch partners who will have items like gift cards, loyalty cards, discount cards, and boarding passes integrated for use in the app via barcode.