There was something mentioned, I think maybe in a Q&A session, about the Shadow Trooper changing, but you're right Justin that a different Shadow Trooper (who had a removable helmet and baklava/ski mask thing) was pictured at (I believe) Toy Fair.
That figure may have shown up overseas as well, but was not in the set ultimately.
And yes, this hobby can be exhausting.
I'm a big advocate of pre-ordering what you can when you can, if you can... I don't always follow my own advice on that though either, but usually our sponsor Entertainment Earth, or Big Bad Toy Store, come through on all pre-orders you put in...