UPDATE: Release date is now July 9th, 2015
As we approached the release of A320 Family Immersion a few days ago, we found that a few effects didn't quite match up with our high expectations when it comes to quality. So we decided that we had to go back to the drawing board and fine-tune some effects. We want to ensure that the quality delivered in the end-product is going to be as good as possible, and therefore we are not afraid to go-around and hold a little longer for the release. We are actively working on it and we'll let you know when it's ready.
In short: A320 Family Immersion will happen quite soon, but it has been pushed to a not so far-off future, once we feel it's ready to be released.