If it's anything like it's been in previous seasons (which I'm guessing it will be), the commentary will be entirely in Greek. Often, the second commentator is a current or former player, like how Panathinaikos tapped Dpaps for that last friendly.
You do bring up a good point though. Especially for international games where we maintain the rights, having an English option front and center probably would make the stream all the more enticing.