Updated OP with the new information.
I appreciate NRS actually being transparent, I hope they continue to do that. With that being said, this is really disappointing. I can deal with the reveal being pushed back, that's not such a big deal. But if all they are going to do tomorrow on the stream is play the Beta, then that's beyond disappointing -- it really sucks.
The vast majority of people aren't even in the Beta yet, plus there's tons of people frustrated with how they handled the Beta so far. On top of all of that, there's people expecting reveals or at least gameplay breakdowns/reveals of Poison Ivy, Bane, and Brainiac. Of all times, why would they choose NOW to start playing online.
Yeah... no. I hightly doubt that. Ed Boon pretty much low-key confirmed that the Beta wasn't going to go Open because they have to do testing.
Here is what I think is going to happen on the stream: It's going to be an hour long, maybe not quite. They will mention reveal dates and tell us to "stay tuned". They will confirm that another "wave" of codes will be sent out, and that the Beta is updating with either Gorilla Grodd, Wonder Woman or Harley Quinn. They will play online for a while. Then they will do a small Q&A w/ shout-outs. After that Tyler and Derek will have a Lantern Battle.