Furies. They have been redone, they are coming for Daemons, they look so much better than the current models. The question will be if their rules make them worth it. They are about Nid Gargoyle sized, maybe a bit larger. Bat wings. Much more daemonic heads with toothy maws in 2 parts like the horrors and bloodletters. Not the bat men of old. Dual kit with a new ground based daemon, much like the vargheist/crypt horrors (which I've mentioned before).
There are a lot of questions winging my way about the GD. So to try to address those:
1. I don't know for sure all 4 will be released at once or if they will be in waves.
2. I have conflicting rumors they are moved to the oval base and are roughly the size of the beastmen gorghon, vs staying on the 60mm round bases. Based on my personal eyes on on WIP before, they are bigger. The Greater Unclean One was not as big as the FW model, but its bigger than a dreadnought. My source says the Greast Unclean One is the best looking of the new models, that it is "absolutely rot, in a good way".
3. The Blood Thirster should be slightly shorter than the dreadknight. stylewise it hasnt changed much.
4. The Keeper of Secrets is the most changed style wise. Does not go towards the FW model or retain the style of the current GW model. Still very slaaneshi
5. The Lord of Change AFAIK is the tallest of the models, not just due to the wings. Did not appear as hunched as before. Head options include a more fishy looking option.