Disgaea 3,4 Guided Fate Paradox intros black screen

Broken ever since quite a big rewrite back in october. There's issue #1263 for it.

when is it planning to be fixed? i want to do some testing

It will be fixed when someone decides to fix it. Same goes for almost anything.
Basically, expect nothing to work and be happy when it does. And when you find something interesting weird, or encounter some problem, simply report it in the relevant thread, so developers can maybe take a look at it.

ok thanks and are u planning to add dx11 or vulkan in to the emu

There's no point in adding DX11, as it's old and you'd likely never be able to run any games at full speed with it. It's also Windows only.
Vulkan is that I'd definitely like to see in the emulator, and if noone is willing to take the task before me, I'll try to eventually get Vulkan renderer up and running, but that won't be before I've played around with it in my other experimental program.