Given Kaidos epiteth "Hundred Beasts Kaido" I would expect rather simple outcome- Lion Zoan as Lion is somehow symbolic King of Beasts.
As for Chimera and other kinds of beasts I would expect his top commanders to hold those abilities.
But given that Kaidos one of favourtie islands is the one that Caribou landed on, snow island with mountains made out of something not natural(they looked to me like tents with metal skeleton when they were shown while being constructed) he can be also some kind of snow-related beast.
Also after how Drake picked Kaido as his Yonko to ally himself with and how Kaido was said to kill all of Morias subordinates for me Kaido somehow feels like ex Marine or somehow related to them.
After some show offs from Oda with how he can develop characters like Bellamy as well as obviously Doflamingo and Fujitora I kind of gotten higher expectations when it goes for new characters that we will see soon enough like Kaido, Green Bull and also plenty of those that are not on top, like Yonkos subordinates etc. New World feels for me as good as I expected, hoped for.