I played some of GSB1 with my brother, but it was such a pain playing against each other. We wanted to watch the battles at the same time in real time, but back then you could only watch the replay and send another challenge.
This was really awkward because it totally ruined the immersion. One of us would already know which fleet had won when the other had to watch the replay. Would love to be able to have both players watching the space battle at the same time, maybe even be able to chat with each other.
What improvements will there be for PvP/Multiplayer in GSB 2? Would like to know before I buy this game 
cheers!