I do not think there has been a decent Samurai Shodown game since IV and the Sen travesty burned a lot of potential new fans.
Even if it comes, I do not see it being successful due to its clunky nature.
I would personally love a balanced and fully featured Last Blade, but in 3D it would get a lot of shit and very few sales due to Soul Calibur comparisons.
Soul Calibur V is pure horse manure from an objective standpoint relative to the original, but that customization trash bag it carries is highly regarded and Capcom lovers are all over that meter-filled, streamlined, unbalanced bullshit.
However, I was never big into Samurai Shodown and mostly stuck to II, whenever I wanted to play.