That is indeed George Takei of Star Trek fame offering his voice as General Lok Durd. This is the first time any of the star players from Trek has crossed over for a role in Star Wars, though the video games have shared supporting players in the past.

The Separatist shield generators have Aurebesh stenciled on them that reads "Caution."

When Ahsoka cuts down droids inside the Separatist base, she is shown in silhouette and her lightsaber casts a shadow. Contrary to online debate, there's nothing wrong with this. Lightsabers do indeed cast shadows; anything that is opaque does. Try it with a fluorescent light tube.