This isn’t an April Fools joke. Disney+ has just updated their apps to add some new profile icons, and the additions are the X-Men from the 90s animated series.
You can select from Professor X, Magneto, Cyclops, Storm, Rogue, Gambit, Beast, Jean Grey, Jubilee, and of course Wolverine:
I’ve confirmed they’re showing up on the iOS app. If they’re not showing up on your app either close it out and reopen or see if there’s an update available.
This likely doesn’t signal any major new X-Men additions as they’re for the 90s animated series and in the US HBO has the streaming rights to the newer Fox movies such as Dark Phoenix.