They should take the same care as commonly sold nobile hybrid.
By the way, I've never seen yellow either. always orange. It is nice though! I love yellow flowers!
My dendrobium nobile "yellow song" canary would make relatively long "spike" for nobiles where 3-6 flowers are born. When it gets long with 6 flowers, it sometimes grow roots out on the spike itself. but the ones that do make roots also have some leaves at the base as well. It start out as if it is a keiki then turn into a spike it seems.