I've managed to spend a little bit of time reading through the Daemons stuff - though by no means all of it. For Daemonettes the bonus for being 20+ models is a bit disappointing because while the bonus itself is rather nice fielding a large squad and keeping it that way doesn't sound too practical especially on a T3 6+ unit. The Daemonic Icon sounds like a way of mitigating this however - certainly better than nothing, but I'm not expecting to get much use from that extra attack even if you do roll well on it (it's 25pts too).
Daemonttes do hit quite well though so that attack would really help fishing for those 6s to pass right through all but the best armour. At 9pts a model they seem ok for price? Seekers seem to be quite nice for 19pts each, being quick with 14" and being able to advance and charge? That comes across as lightning quick and as ever it looks like Daemonettes want to be in combat as soon as possible so this could be a great play early game. 2 Wounds too, maybe I should have got more than 10 when I had the chance!
I have no real interest or knowledge on the chariots, though they seem ok to me? Heralds and DPs for more psychic powers appears useful too, and Fiends while more expensive having the ability to prevent falling back should be a great trick. They also hit pretty hard and mess with enemy psykers This is all conjecture of course, and could be deeper as there does appear to be a bit of a shortage on higher Strength attacks.
What do others think, especially compared to experiences in 7th?