The consultation paper is here:
Getting Married: A Consultation Paper on Weddings Law.
The consultation questionnaire is linked from this page.
Links to Welsh versions and other related documents are here.
The consultation document is very long indeed, but there is a helpful precis of what it is about here:
Law & Religion UK Reforming wedding law in England & Wales.
There are some media reports here:
Church Times Law Commission suggests sweeping marriage reforms
Religion Media Centre Wedding reform proposals allow humanist legally binding ceremonies
And there is some theological comment on the topic by Nicholas Henshall at Via Media Worldly Weddings – To Bless or Not to Bless?