I just looked at the Ghost site and the reference to September has been removed. The apology to SR9 owners is still there, but rather than a named available month it just says ".... further delays."
I wouldn't be surprised if it's scuttled for good. There's a helluva lot of liability involved in producing a product like this. If their product did anything to remotely affect reliability or safety, it would be best if they just decided it wasn't worth the risk.
I wouldn't hold your breath waiting for a replacement trigger group for the SR9.
Their note to SR9 owners is still up on the front page of their website. You'd think that if they were dropping the whole idea they'd just quietly remove any mention of it.