If they're only hiring now, I doubt that they'll be at full production speed until mid May at least to allow for training, snagging the production lines etc. That doesn't allow much time to build up a decent stock for shipping to the launch countries in June. That also doesn't allow much for the actual shipping time - even if using air freight, its probably a week or so to get decent stock to the warehouses. How much stock were they rumoured to have when launching the iPhone 5? Given silence on iOS and the logistics, I'd say that August/Sept launch is likely unless launch is limited to the US.