Future experimental cosmology missions aim to explore the early Universe through high-precision measurements of the Cosmic Microwave Background (CMB), with a focus on both its polarization and spectral properties. Projects such as LiteBIRD and LSPE-SWIPE are designed to detect the faint B-mode polarization signal, a potential imprint of primordial gravitational waves predicted by inflation. Furthermore, the COSMO experiment targets spectral distortions of the CMB, defined as minute deviations from the blackbody spectrum. These distortions are believed to carry information regarding energy release in the early Universe. The observations will be carried out from space, stratospheric balloons, and ground-based telescopes. These different vantage points will provide complementary advantages in frequency coverage, sky coverage, and control of systematic effects. Together, these efforts will open new windows into fundamental physics, including inflation, neutrino properties, dark matter, and the thermal history of the Universe.