New particles. If it can see close enough to the big bang, or what we think was a big bang, we may see particle behaviors never seen before. Energy forms that are odd and behave strangely.
“...Energy forms that are odd and behave strangely...”
We already have these in the White House today.....
I think we will run into the fact that until about 300,000 years after big bang the universe was opaque. The cosmic microvave background is as far back as we can observe. We may be able to get more details on items very far away (such as a galaxy discovered recently that is 38 billion light years distant as calculated by red shift) and much better images of just about anything it is pointed at.