User blog comment:MisterWoodhouse/The Future of Gamepedia/@comment-26465213-20201104230730/@comment-24006128-20201112135443

Here's the exact quote from the blog:

In cases where there is a conflict between wiki names, we will be making subdomain changes. For a community that was part of Project Crossover, like Fallout, the combined wiki will remain as fallout.fandom.com, while the archived Gamepedia wiki will become fallout-archive.fandom.com when it migrates. Likewise, for a crossed-over community like Magic: The Gathering, the combined wiki will migrate from mtg.gamepedia.com to mtg.fandom.com while mtg-archive.fandom.com will be the new home of the archived wiki on Fandom. For communities which have not crossed over, either due to their decision not to do so or their crossover not being completed, staff will be selecting subdomain names, mostly based on traffic data over the past 3 months. There will be a list of these changes available when they are ready. For non-English Gamepedia wikis, they will be transitioned to the Fandom domain structure, like fallout.fandom.com/de instead of the Gamepedia style of “ - ” in the subdomain. Based on our Wikia.com to Fandom.com migration experience, we expect that some wikis may experience a loss in SEO caused by content formatting issues. We are committing that our teams will help those wikis take steps to reverse those negative SEO impacts if they happen. Gamepedia URLs will correctly redirect to the new wiki URLs on Fandom.