Well you're getting an expansion on the endings now with new cinematics and epilogue scenes to explain what happens after the endings for free. Check Alrik's link. I read it from here:

http://www.bbc.co.uk/news/technology-17626125

Here's Bioware on the matter:

http://social.bioware.com/forum/1/topic/324/index/11028404

It's called the Extended Cut. I wonder if it'll add new gameplay content though. Whether this makes the endings any better though is unknown to me. I haven't even played the full game and experienced the endings to say what could make them better.

Let's Play Divine Divinity - The Damned One's Tale - Chapter II.