Well, the daemons will remain tops, especially with flamers potentially getting better (one rumor is that skirmishers can shoot after marching). You will see less greater daemons, but the rest of the army is hard enough that it hardly matters.
VC will still be good, but have a few less points to throw at characters (only 50% of the army

).
Lizardmen will see lots less engines and a few of the slann may be cut back (so a 450 point Slann instead of 500+, hardly a difference), but plenty of points will still be around for scar-vets (y'know, 25% of points still can be spent on characters). Saurus with spears only get better (going from 25 strength 4 attacks to the front to what, 31?). The lizardmen will be as good as normal.
This edition can try to fix the top few armies, but generally I don't think it will. Some books will still be better than others, especially daemons.
~Grant