Fact #1: According to the Newt, wave 2 was pushed back by the Ep. VII "stuff." Some of the X-Wing stuff was leaked, but I bet there will be a few more items released in early September.
Fact #2: We have received no new news articles on Wave 2 since its initial announcement, only a few strategy articles.
Postulation on Fact #2: It would appear these were written to tide us over as they were not ready to start leaking wave 2 details.
Postulation on the lack of wave 2 spoilers: FFG won't spoil wave 2 details, and thus get us excited about buying it, if there is already something for us to buy.
Prediction #1: There will be at least two armada products coming in early September that tie into Ep. VII. One of them will be the new star destroyer.
Prediction #2: Once those are released, we will start seeing Wave 2 articles.
Why I am probably wrong: FFG is probably not getting us excited about Wave 2 products so that we will purchase the new stuff from the game we don't play as much anymore (X-Wing). I don't know how much time FFG had to design the new tie fighter and x-wing, but it stand to reason that armada products take longer to design and play-test. Therefore, we may not be seeing them until Wave 3 or 4.
Why prediction #1 feels wrong: Why would we get a new star destroyer when we don't have the ISD yet?