The howling banshee speed seems to be up to par no changes needed as of yet for the speed. The scream is locked to "T" even when you change the Battle cry it sticks to "T" which of course needs to be flexible. The effects of the scream are unknown so there should be some form of indicator it's effecting the target. The cool down is also unknown so a bar or something should indicate that. It may have been a bug, but I was able to spam the actual scream, therefore I wasn't sure if it was actually working or if it even had a cool down. I hope this helps in improving the Banshee and brings much joy to Khaine.
Handy stuff, but I should note that UAT stuff is still NDA. Not sure how we get around that with it being open to everyone, but some of us don't have access to the appropriate location on the forums.