You can still buy the Atrio directly from Future Sonics as they have a reserve for their pro-customers, etc. But, yes, it's discontinued otherwise.
Yes, Future Sonics is in the process of designing a new universal iem. I can't say any more than that (other than it'll be a while, they are very deliberate as things have to not only sound great, but also be reliable). I for one am very interested in what they will come up with!