GNOME 3.24 RC2 is mostly comprised of bug-fixes throughout the core components and applications, given the various freezes. Some notable standouts include Epiphany fixes, GDM better handling misconfigured auto-login systems, better drag-and-drop support on Wayland with the GNOME Shell and Mutter, bug fixes for the early GTK4 state, a lot of work on GNOME Builder, and many translation updates.
The GNOME 3.24 RC2 release announcement can be read on the devel-announce-list. I'll write-up a GNOME 3.24 feature overview ahead of the planned 22 March launch. Overall, GNOME 3.24 has shaped up quite nicely and the Wayland support has continued maturing a lot too.