Here we go, we've got... more commanders? And officers. Nothing but faction locked stuff in this round of spoilers.
I must not quite be seeing what is making Trench good. He seems to be quite a large price for double commands. Maybe he's your squadron commander letting you double up on key turns with navigate, or pull big engineering out.
Mar Tuuk is going to be a giant pain in much the same way Romadi is. +1 die if you attack a shield, -1 if your opponent has no shields at all, but you get to choose the die. It's a good benefit for not a very dangerous minus. I think he is my favorite of all of them.
Free accuracies for squadrons attacking a ship that cannot be "rerolled or changed" which means you're spending them - either for blocking a key token like redirect, or for a card that we'll see in a second. Plus Grit whenever you are running some Jedi.
Yularen (Commander) is another squadron commander, letting you activate an extra squadron with a squadron token, and repair squadrons with engineering.
Here's the rest, listen to our podcast if you want to hear us (and IrishMadCat) talk about them!