The COMPASS++ /AMBER (proto-) Collaboration proposes a broad experimental programme for the “New QCD facility at the
M2 beam line of the CERN SP”, to ommense after 2021. In
this article, a few of unique second-generation experiments
that rely on high-energy high intensity RF-separated kaon beams planned to operate after 2026 are highlighted: the kaon spectroscopy
with kaon beam, a study of the gluon distribution in the kaon via prompt-photon production and a kaon polarisability measurement.