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iCloud Keychain: Using mobile to approve password syncing
Using the "send to iPhone" over-the-air option, an iPhone or iPad can approve a Mac to use passwords or not. This has to be performed on as many devices that you want to use your cloud-based passwords with.
iCloud Keychain: Password support
Among other things, iCloud Keychain allows you to forget the need to enter passwords -- at least on your trusted devices. Using the in-built browser Safari, Mavericks can generate random passwords that are entered automatically and stored in the cloud.
iCloud Keychain: Remembering card payment details
It works across devices, such as OS X machines and iPhones and iPads. In testing this, you can enter secure credit card data on a mobile phone top-up page and Safari will allow you to "remember" this card. The data will be stored in the cloud, allowing trusted Mac to use that data in future.