Really? I called today (Milan, MacPro) and they basically told me to call back at the end of the week because they haven't gotten any new collection yet. I hope it wasn't an April Fool's joke!
I'm in Rome and I was told by the MAC Pro store here that it's exclusive to COIN. I haven't been to the local one yet but will do in the next couple of days.
Update - the collection is now on sale at COIN in Rome.
I live in Greece and the release dates are usually the same with Italy.
Today I went to the MAC store and Heatherette had just arrived! Too bad I've already ordered most of it from ebay