In Aus and got this done 2 days ago. Met with a genius, she was so kind and decided that my phone was covered under warranty as it's a hairline crack ( and some scracthes at the back of my phone ). So I do not have to pay a thing!
TOO AWESOME and very glad as I could be paying up to $349 depending on the damages on the phone. The genius must be in a really good mood as the crack was about 7cm - 8cm long.
However, the phone that Apple is replacing is a refurbished phone. The genius explained to me it depends on how do you look at it. The new phone that we initially get, all parts being put together by the team. This "refurbished" phone parts were also being put together, tested by the same team and never owned by anyone. I was promised the new phone is "exactly" the same as my old phone. I got my initial phone back in Oct 2013 so the warranty will still start from Oct 2013.
Sorry if the reply is too long but trying to give as much information as possible as I know how devastated it is to have a crack screen and not able to get it repair by Apple!