Aside from being based on Fedora 39 now, KDE is now the official desktop environment replacing GNOME. The reasons why are in the article.
The GNOME version of Nobara still exists, but it’s going to be the vanilla version shipped without any extensions (probably because many of them broke after moving to Fedora 39)
Gnome is still there, just not by default and Bazzite defaults to KDE Plasma as well.
I just saw that. I’ll keep looking.
But why? Not being the default doesn’t mean that Gnome isn’t available. As both are Fedora derivatives, both should have good Gnome support inherited from Fedora anyway. As the changelog says, only a handful of Gnome Shell extensions will no longer be provided in the Nobara repository but instaling them manually from extensions.gnome.org is a breeze.