Emperor is dead. Vader comes back from the Dark Side and also dies. Luke & Leia know they're siblings.
Seriously, what's the plot going to be?
There was basically a plot clue in Episode 6. Luke's hand had turned black. He succumbed to rage while defeating his father (using the "dark side", taking the first steps). Basically he will rediscover the ways of the Sith while Leia becomes the "mother" of a new order of Jedi.
If fixing the standard model leads to a way for us to utilize the zero point energy, this discovery might just lead to a new way to blow things up. And if -- ghod forbid -- we discover a way to make the vacuum unstable, then we might learn how to make one really big boom. Just one, because it will consume the entire universe, but that one will be REALLY BIG.
This sounds like the background plot for "Plan9 from outerspace"... althought there it was a chain reaction from cleaving photons or something... let's just look out for zombies anyway...shall we?
Living on Earth may be expensive, but it includes an annual free trip around the Sun.