They are not changing the core of the endings, which was my main problem with it.
Having said that, here's what I hope they *will* do with the 1.9GB:
- Upgrade Alliance's attack on Earth:
a.Now we will be able to see every species we were able to gather "standing by" before attacking the reapers.
b. We will see more ground troops (Batarians? Rachni?) fighting alongside.
a. We will have a general outlook on the galaxy and why it isn't "doomed".
b. We will see what happens in every possible ME species. What is the future of Tuchanka? Rannoch? etc.
c. We will see our happy companions' future, perhaps some burial of those who didn't make it.
d. We will see what happens to Shepard, and if there's a LI, both together watching the sun go down, etc.
I'd hope for all the above. But quite frankly, my dear, I almost don't give a damn anymore.