Several relevant arXiv submission came out in the last week.
https://snowmass21.org/submissions/start
Luis A. Anchordoqui, A. Ariga, T. Ariga, et al. “The Forward Physics Facility: Sites, Experiments, and Physics Potential”, arXiv:2109.10905 [hep-ph] (pdf). (also under NF0, RF0, CF0, TF0)
Jonathan L. Feng, Felix Kling, Mary Hall Reno, Juan Rojo, Dennis Soldin, et al. ”The Forward Physics Facility at the High-Luminosity LHC“, arXiv:2203.05090 [hep-ex] (pdf). (also under NF0, RF0, CF0, TF0, AF0, IF0)
Weidong Bai, Milind Vaman Diwan, Maria Vittoria Garzelli, Yu Seon Jeong, Karan Kumar, Mary Hall Reno. ”Prompt electron and tau neutrinos and antineutrinos in the forward region at the LHC“, arXiv:2203.07212 [hep-ph] (pdf). (also under NF09, CF07)
Tau Neutrino white paper: https://arxiv.org/abs/2203.05591
Experimental coordination activities are in progress.