Noctua released a statement on existing cooler compatibility with the upcoming Intel 10th Gen Core-S series, aka Comet Lake-S.
Noctua announces cooler compatibility with Comet Lake-S
The good news is that most of the popular coolers are already compatible with CML-S out of the box. This is because the mounting on LGA1200 socket is identical to LGA115x, the manufacturer says.
Noctua separated their coolers into four groups: compatible out of the box, those which require upgrade kits and those which are not and will not be compatible. Depending on the cooler, you might request the upgrade kit free of charge from Noctua, otherwise, it will cost you around 9 USD + shipping.
|NOCTUA LGA1200 Socket Cooler Compatibility|
|Compatible out of the box||Require NM-i115x upgrade kit|
|Require NM-i115X upgrade kit|
|NH-U12DO (Note that the A3 version is not compatible!)|
NH-U9DO (Note that the A3 version is not compatible!)
NH-U9 DO A3
A leaked slide from a few months ago already confirmed that Intel will retain the dimensions and thermal retention from Coffe Lake-S. The socket only has a new keying configuration which should ensure that no 7-9th Gen Core CPU will fit.