Preview at WWDC likely in June, followed by September launch.
T-Mobile Germany Begins Distributing Nano-SIMs to Retailers
T-Mobile Germany's nano-SIM (left) and mini/micro-SIM (right)
According to the report, materials included with the shipment indicate that the nano-SIMs are to be used to for the "latest generation of smartphones" that will be arriving on the market in the near future.
European carriers were reported in July as having been stockpiling supplies of the new nano-SIMs amid expectations of high demand for the next iPhone and past experience with card shortages when Apple transitioned to the micro-SIM standard for the iPhone 4. At the time, carriers were also said to be testing the new nano-SIMs in partnership with Apple.