The migration has happened as of January 24th, 2019.
Original blogpost below.
Hey all,
Just a quick and mostly unnecessary news update related to the Wiki itself: As you may see on a banner at the top of any given page, the Sly Cooper Wiki will be migrating from the Wikia domain to the Fandom domain in the coming weeks (the change will happen by February 4th). This means that the website name will change from http://slycooper.wikia.com to http://slycooper.fandom.com.
As far as I can tell from visiting other wikis that already have migrated, going to http://slycooper.wikia.com will still bring you to the Fandom site, but a redirect will occur.
We don't have any choice in the matter; Wikia rebranded itself to Fandom several years ago, and this is an inevitability that comes with that. We will likely lose some traffic after the change, but according to some research completed by Fandom itself, after time this may actually increase traffic slightly, since the domain name and company name are consistent, rather than having the disparity of a "Wikia" hosted by "Fandom." This has to do with Search Engine Optimization, or SEO.
If you would like to read more about this, you can check out this article written by Fandom: Fandom domain migration.
As a final note, we will still remain the "Sly Cooper Wiki"; our personal branding will not change to "Sly Cooper Fandom." Also, if you haven't already, you should join the Sly Cooper Wiki's official Discord server at http://discord.gg/yazWfVv. There is a 10 minute wait time to get in, but after that, you will be able to speak freely about Sly Cooper or any subject under the sun (while still following the rules, of course) with individuals that share a love of the Sly Cooper series.
Teenbat
Bureaucrat, Sly Cooper Wiki