Currently there are four marketplace proposals in the AIP process. Magic Eden, X Marketplace, Zheerwagon, & Rarible. Each of these have different nuances & strengths. All of them want to be hosted on the official website. There appears to be considerable support for multiple marketplaces.There are questions around website management & security that will need to be addressed.This will probably need to happen in the form an AIP that outlines strategy for management of the website including security updates. Having a drop-down menu w/ marketplace choice is a potential solution
Twitter spaces have been hosted recently by most of the marketplace teams. Specifically Magic Eden has had great community engagement & has taken the time reach out to many community members to gather feedback. My favorite of the proposals is by Zheerwagon because of features included.