Some of those rumors are confirmed such as using your old character but that multiplayer option if true seems awesome. Reading that whole list it doesn't seem like it's possible to fit it into one DVD.
However this rumor stung me a bit
-Depending on the decision made by the player on Noveria to either spare or kill the Rachni, they will assist you during a crucial time or you will be left alone
NOOO I killed the Rachni >