I just got an update so it looks like the updates are in place now looking at Soul Prices now
Rare Souls - 50 frags
Rare Gunner/Assassin Souls - 150 frags (seems a bit high)
Legendary, Heroic Legendary and all Class Epic Souls - 250 frags
All Mythical Souls - 500 frags
All others unchanged.
Checking the Banshee now.