Preview at WWDC likely in June, followed by September launch.
Apple Licenses Swiss Railway Clock Design for iPad's iOS 6 Clock App
The Verge now points to a press release [Google translation] from the railway service announcing that a licensing agreement has been reached.
For the use of the SBB station clock on devices like iPad and iPhone, the Swiss Federal Railways SBB and Apple have agreed and signed a license agreement.
Apple's iPad clock app (left) and Swiss Federal Railways clock (right)
Terms of the licensing agreement, including payment and term length details, were not disclosed.