I know the Phase Rifle used to look different and the Deatomizer used to still have a scope. The bullet tracer used to be white lines (like in TCon) instead of the yellow projectiles that we see now. The crosshair used to be 4 straight white lines, I think it was changed so it wouldn't blend in with what you are aiming at. And lastly, there is this Trust armor that I really wish they had put in the game. It was just a chest piece that had a bunch of pouches on it, I think the drudge has one just like it.