I've built 6.13-rc5 kernel and kernel-dtb using the Armbian build tools, and pushed that to my Orange Pi5 running Armbian Bookworm that itself shipped with the 6.12 kernel straight from the download page. I installed kernel/headers/dtb packages with dpkg and rebooted, and it worked without issue.
The kernel enables the VOP, and I can get 1080p120 and up to 2160p30 resolutions working on my 4K TV via HDMI. 2160p60 doesn't show up as an option, but I'm unsure if that's a limit of the current VOP driver, or my cable. (There's talk on the mailing list about more work needing to be done for certain resolutions to be supported). I'm running X11 currently (default from the Armbian image). I'll try Wayland at some point.
I've compiled in Mesa from git-main for the Panfrost drivers, and Vulkan seems to work pretty well. I get a few odd colours randomly here and there, but I assume these early bugs will sort themselves out in time. I initially didn't get OpenGL working, but that's because I forgot to compile in the drm-shim tools in Mesa. With those compiled and installed, OpenGL works fine too without the need to do any LD_PRELOAD stuff in the Mesa documentation (I think that's outdated info from the 24.x tree), and is quite fast. Simple OpenGL-display/scale things like MAME can happily achieve 400% speed output, and aren't being capped by the GPU's bandwidth like they are on some older SoCs. The Mali G610 is a pretty nice GPU, I have to say.
Zink isn't working so well just yet, but also I haven't tried limiting the OpenGL version it's attempting yet. I probably need to pull that right back to match the features available in the current Panfrost Vulkan implementation. Although the Panfrost Gallium driver seems to work well enough for OpenGL, so that's nice.
I'm quite impressed with how well this works even with code that's full of "testing only" warnings. I think across a variety of games and emulators I've had one crash so far. Pretty exciting to see this board fully supported by mainline kernel+mesa finally. Seeing GameCube emulation running at full speed with Vulkan on this little SoC is really cool.
Kernel 6.13 was released officially yesterday, so hopefully we'll see this all appear in the "edge" Armbian packaging soon.