It's April, so the soonest we would see 2.4 is July/August. Based on some things that have been said, it's possible that our actions could trigger 2.4, and if that's true, then it might come sooner than anyone thinks, despite what the Community Manager just said in this thread. What's more likely though, is that 2.4 will be around the Christmas season, perhaps September/October. It's a shame that 3.0 will most likely miss that window, but I just don't see it coming this calendar year. The current content needs time to bake in the live environment for a while, before the new hotness arrives.
Regarding the Mystery IP:
As I recall, the statement said two things; an enduring movie franchise, and Frontier's expertise, so:
The IP is most likely Star Wars.