Preview at WWDC likely in June, followed by September launch.
Apple Asking Some Developers to Have Apple Watch Apps Ready by Mid-February
It is unclear if Apple is asking the same of other developers, but it is possible the company is hoping to test some third-party Apple Watch apps with employees ahead of the device's launch to get a better feel for battery life when using non-Apple apps. As we detailed earlier today, thousands of Apple employees in the Cupertino area are wearing and testing the device on a daily basis to work out final kinks ahead of an April launch.
It's also possible that Apple could use this high-profile partner's app in an upcoming demonstration or launch event to show off how Apple Pay works on the Apple Watch. Apple Pay will be a key function of the Apple Watch, letting users authorize credit card payments right from their wrists. As has been outlined in the past, the Apple Watch will authenticate payments biometrically, requiring a passcode when the device is first placed on a wrist and again if it loses skin contact.
Apple CEO Tim Cook said earlier this week that Apple Watch development is on track and that the device will launch at some point in April. Pricing for the Apple Watch is largely unknown, but will start at $349 for the least expensive option.