Being able to take control of the Goblin Doom gliders looks fantastic fun.
That scenery is amazing. As he said, something that's never been available in other Total Wars. On the same not, the army variation. Total War games always felt lacking in that department before. Mostly the same units, few unique ones here and there, buildings mostly all the same. But here, each army is completely unique. It's amazing.
The monsters and their animations are fantastic as well. That this is all pre-alpha is very impressive and leave me really positive. Spells look interesting too.