Oda needs to give the marine heroes: Coby and Smoker a power up. He's neglected them for far too long. I see the science force doing this.
For Smoker, I believe Vegapunk has figured out some way to forcibly awaken a DF. This process was imperfect in the past, resulting in the impel down zoans, but now perfected, I think smoker will be one of the recipients of this ability and will awaken his DF.
Crocodile had a special ability that most likely was awakening. By touching something, he could drain the water out of said object, turning it to sand.
Similar to how crocodile could dehydrate people and objects to turn them into sand, I believe that smoker will gain the ability to burn objects in order to turn them into smoke.
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I mentioned this before but I think Coby will get a gigantification serum. Overall I think this power would parallel nicely to Luffy's gomu gomu no mi as well as giving Coby a well deserved upgrade.
In terms of mechanics, I see it working similar to the hulk's ability in marvel. I think becoming big would cause him to lose control of his mind and become enraged. He could become as big as Katakuri and things would be okay, but once he starts approaching kaido/big mom levels, he'd go full hulk.