"apple shouldn't release it" is IMHO clearly wrong. They were absolutely right to release it when they did, at a stage where it was just about stable enough to write working apps but many of the features of the language were still being iterated on. Yes that means the language definition isn't yet stable, but the huge advantage us that iOS devs have the chance to influence the development of the language and it's libraries.
Whether or not it's the write time to use it in production is another separate issues that will depend on the app. For fairly simple applications it seems like it's fine to use it now. There is talk that Apple have banned use of swift within the company. That's obviously false, otherwise they wouldn't be able to further develop the language. I do fully expect that to use swift in a production project you would need high level authorisation and probably close coordination with the swift dev team. That would just make sense.
Whether or not it's the write time to use it in production is another separate issues that will depend on the app. For fairly simple applications it seems like it's fine to use it now. There is talk that Apple have banned use of swift within the company. That's obviously false, otherwise they wouldn't be able to further develop the language. I do fully expect that to use swift in a production project you would need high level authorisation and probably close coordination with the swift dev team. That would just make sense.