I'm a bit concerned about the weakness-to-fire debuffs the High Elves now have access to. Kindle Flame&Fire Spells + the Talons RoR archers + Sisters of Avelorn is just one combo, you can also work in Imrik's debuff, phoenixes and dragons. You can squeeze all the options into the same army list but you don't need to, a small amount of them might be very, very problematic for certain match ups.
How will Tomb King players deal with High Elf armies built to snipe their (weak-to-fire) lords? There are no Liche High Priests in the game, as of yet, so Tomb Kings are now incredibly easy to shut down. Players wanting to take the new Greenskin content online might also have very bad experiences, as their new regenerating lord and units will just melt if properly targeted.
I'm always ready to yield if a more experienced player makes a good counter-argument, but these new synergies feel really toxic to me.