Not sure if anyone mentioned it, but looks like the warscroll downloads on the GW site for Beasts of Chaos have been updated to the new format and presumably with the new rules.
Edit:
Timber! on the Chaos Gargant is significantly different from its old iteration, the roll-off winner chooses a point within 3" of the gargant and all units within 2" of that point take d3 MWs.
Chaos Spawn got a new warscroll, has both the Slaves to Darkness keyword AND Beasts of Chaos now.
Tuskgor Chariot is now +1 Attacks on the charge instead of re-rolling failed hits, its spear got +1 to hit, and the axe has the Despoiler ability from the preview
Chimera got an extra Attack on each weapon profile, and an extra 2 on its Claws
Cockatrice Talons now are 4 Attacks instead of d6 (8 instead of 2d6 on the charge)
Tzaangors now have the Beasts of Chaos and Brayherd keywords in addition to all the others
Tzaangor Skyfires/Enlightened don't have Preternatural Enhancement anymore, it's an ability on the Tzaangor Shaman now, is now wholly within 12" instead of within 9"
Tzaangor Skyfires Judgement from Afar is now on unmodified hits of 6 (sorry Tzeentch)
Tzaangor Enlightened have 3 spear attacks now
Tzaangor Shamans can drink their elixir at any point in the hero phase now instead of at the start
Tzaangor Shaman's Boon of Mutation now adds a model to an existing unit instead of making a new one
Shields that gave +1 Save in the combat phase now seem to be against any melee weapons, regardless of phase
Razorgors aren't forced to charge if they're within 12" anymore, no longer gain +1 to Hit when they charge, instead unmodified hits of 6 on the charge deal an extra MW
Great Bray-Shaman wounds on 3's now, and their movement aura is wholly within 12" now instead of within 8"
Jabberslythe doesn't have a monster degradation table, has a move of 12", Spurting Bile Blood only does 1 MW now instead of d3, his Slythey Tongue now does d3 damage instead of 1
Centigors got an extra attack profile for their Clawed Forelimbs and an extra 2" of movement (now 14")
Dragon Ogor Shaggoth doesn't have a monster degradation table, has 8" move
Dragon Ogors got 2 more attacks with paired weapons and now hit on 3's but don't reroll 1's to hit, Draconic Crusher hits on 3's now, can now re-roll 1's to hit with any weapon if within 12" of a Shaggoth
Doombull has a 4+ Save now (probably since there's no shield option anymore)