A few things I noticed.
1) They fixed the wording for void shields in Stronhold Assault. Suck on that power timmies.
2) Knights can now be the Warlord for ANY army they're in provided they meet a few provisions. A) three Knights , or B) One knight and no other character models.
So remember how people were whining about not being able to do Chaos Knights? Yeah....there we go.
3) Lords of War are apparently simply chosen like normal units now and do not automatically make use of the Through attrition victory or the warlord table unless you're playing a scenario from that book. Combine with changes to Destroyer weapons and that should give 'weak' super heavies more table time as the risk to reward incentive shifted slightly.
4) Scions with vox casters can get another pistol