Oh I really hope his skill isn't reworked, please don't do it! Unless by rework you mean change what scales with magic (switch it so you can get more souls per cast with all your bonuses but a set gems exploded). I like him the way he is, but that change wouldn't be bad.
I love his skill and how he plays. Gem destroyers are so much fun and it has great synergy with troops like sylvanimora and Gorgotha.
I was hoping only a trait rework was coming. I hope it doesn't stay the same because it just feels boring. On death with a chance of happening is lame. But honestly if the feel for this troop is that sort of trait, then I'd rather see his old trait where it's guaranteed but target a specific slot so you can put your least valuable troop in that one. I was hoping for something a little more useful or exciting but that's still a solid choice.
Just my opinion for what it's worth