The Parliamentary Constituencies Act received Royal Assent on Tuesday 14 December. This law will ensure that Parliamentary constituencies in the UK are more equal in size and will make elections fairer.
You can read the Government press release here: https://www.gov.uk/government/news/new-law-passed-will-make-voting-in-uk-general-election-fairer
The House of Commons Library has some new research documents on the topic.
The Parliamentary Constituencies Bill 2019-21 – https://commonslibrary.parliament.uk/research-briefings/cbp-8921/
Parliamentary boundary reviews: public consultations – https://commonslibrary.parliament.uk/research-briefings/cbp-7696/
Constituency boundary reviews and the number of MPs – https://commonslibrary.parliament.uk/research-briefings/sn05929/