For an up-to-date list of the consortium surveys please see the Science section of the 4MOST Website.
As of April 2019 there are 10 existing consortium surveys. They are:
S1 Low Resolution Milky Way Halo
S2 High Resolution Milky Way Halo
S3 Low Resolution Milky Way Disk and Bulge
S4 High Resolution Milky Way Disk and Bulge
S5 X-ray Galaxy Clusters
S6 X-ray AGN and QSO Survey
S7 Wide Area Vista Extragalactic Survey (WAVES - https://wavesurvey.org)
S8 Cosmology Redshift Survey
S9 1001 Magellanic Clouds Fields Survey
S10 Time Domain Extragalactic Survey (TiDES)