No one really knows by now ...
From a technical view, OS 2.0 is 99,99 % compatible with OS 3.0, as pointed out, the
Air 2S features it.
I have not stumbled upon any major issues with a
SC v1 and the
Air 2S from a friend's drone, but I guess, there are not really many people using this configuration.
It's up to DJI to support it anyway and the question when (Day 1, 6 months later?).
I guess a major factor is being able to supply them properly. If not, chances are higher that the
SC v1 might also work relatively early or the complete opposite and may never be supported.
On a side note: certainly OS 3.0 is preferable over OS 2.0, but never had any issues with the "older" one and giving VLOS, bandwith and range never bothered me too much.