I know you meant bat makers by bat trends.
But you could also read it as bat trends like carbo handles, more than 15 grains, laminates, etc!!
The one trend I see as been quite consistent is people wanting BIG EDGES!
And my view is that big edges look the part, and logically you'd say that if a bat has big edges, it's more likely to have more wood and therefore a better middle....this is not always the case!
I have a BAS with 'normal' edges and an Adidas Incurza Elite which one weighs 2'8/9 with small edges, and both bats go like rockets!!