Full white paper here is extensive and announces changes to all avenues of migration - basically their approach to resolving the issues of massively increased migration from 2019-2023/4.
https://assets.publishing.service.gov.uk/media/6821aec3f16c0654b19060ac/restoring-control-over-the-immigration-system-white-paper.pdf
And Starmer's commentary on the BBC: https://www.bbc.co.uk/news/live/ce810e3z6dkt
Handful of headline changes: default timeline to get ILR to go to 10 years instead of 5; abolishing new care worker visas; raising skills threshold for Skilled Workers back up to graduate level; increasing minimum grades required for student visas; various bits and pieces around English language requirements among several other policies