The Nikon D5400 is rumored to be the successor of Nikon D5300 camera. The camera may feature same 24 MP DX sensor same as Nikon D5300 but the will arrive with advance AF system and new image processor, we will update you soon as we get any new information,
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Update– Actually, Nikon D5400 was expected to be the successor of Nikon D5300, but Nikon named it Nikon D5500 when they announced it. And now the successor of Nikon D5500 also camera available, Nikon D5600.
Nikon D5400 is not a name of any camera.