I have high hopes for how slaanesh could work with these
more "keep away" gameplay with blissbarb on foot and on seeker, chariots for crushing light infantry, Slaangors if they have enough wounds could actually end up ok at bullying through lines to get onto objectives with pull through. Keepers could also be scary with counter charging and pull throughs for good positioning
I hope slaanesh keeps its "make a deal" mechanic with temptation dice in 4th, its really fun and thematic but a little bogged down in (always offer and never take the offer), though think a fun improvement would be "if you fail a roll the slaanesh player offers you a fate/miracle dice with a number decided by the slaanesh player to sub in, if you take it the slaanesh player gets to keep a copy of that dice and can sub it in for any roll" so if you fail that roll and slaanesh offers you a tasty 6 you can take it, but slaanesh player will then have access to a pocket 6 to bite you back later.