I own an AI and an AIS version of the Noct. Will keep both, even when the 58/0.95 eventually arrives.
However, the notion of the new Noct being an "Otus-killer" is premature. Even more likely, it will perfect and polish the optical character of the existing Noct, not aiming to achieve a theoretically perfect (yet, ever so often perceived dull and life-less) rendition.