Who is "we" in this sentence, and what are they uncovering?
The "we" is us as the human race, and more specifically, scientists.
As for what they are uncovering, I suggest doing some research. Even a simple google search will bring you many results. Here are two examples of some things that still need more study, but are very new and recent:
1. Potential DNA and fresh tissue is being found in dinosaur bones. From what we currently know about DNA and tissue, there is no way it should be able to survive millions of years. The simplest answer is that these bones are not millions of years old. Certainly, because of bias, many researchers would not consider that they could be less than a million years old so will try to come up with new theories that will answer how they could have survived millions of years. There is certainly nothing wrong with coming up with new theories and ideas and I definitely welcome it. The problem is with biases and assumptions as it can certainly stifle the finding of the truth. There are definitely many biases on both the secular and creationist sides of the issue here.
2. Lucy (often deemed as one of the first missing links found) has recently been shown to possibly have at least one bone from a baboon.
Also, this one isn't so new but is often overlooked. The age of rock layers are generally determined by the fossils found in them, and the age of the fossils are generally determined by the age of the rock layers. The fossil layer isn't as clean cut as it shows in the text books and often we find fossils at layers that they should apparently not be in.