Will the Decepticons left out in space (asuming they are there like the other Autobots) intercept this message and come looking for war? It could be intriguing. I was disappointed to only see one of the "jet fighter" Decepticons. I was hoping that we would have seen Skywarp, Thundercracker and the others.
As far as Jazz goes, I really didn't care. I thought it was cool to show Megatron so powerful as to just rip him in two.
I agree with Gene that we have not seen the last of the "Allspark" or Megatron.