The Eighth Plenary Workshop of the Muon g-2 Theory Initiative, jointly organised by CPT, IJCLab and LPNHE, will be held at IJCLab from 8th to 12th of September 2025. The anomalous magnetic moment of the Muon (Muon g-2) has been receiving great attention, particularly in light of the final result from Fermilab’s E989 experiment and of the intense theoretical effort to match its precision, as well as new forthcoming precision measurements of the dominant two-pion channel. The workshop aims at discussing recent progress on these developments and future prospects.