I might hold off on Hasbro Jazz until pics of this version show up. I really loved United WfC Megatron, so if the improvement is similar, I'm in.
I wonder what colors we'll get for him from Japan? While a second shot at game accurate (either similar or exactly SDCC) would be neat, I hope we eventually get a Valdigus or Battle Gaia. It's funny that you say that, I find the Ultra Magnus redeco works great at bringing that mold to life.
It's weird that these toys keep getting released in Japan, when they haven't gotten either game. It will probably just be regular G1 Bruticus.