I would guess it is going to be:

1a. A new class. I am guessing Monk as they want to keep Paladin for release or closer to release given it is maybe the most anticipated class.
1b. A note on my guess... if it is Paladin, I bet we end up having a Paladin companion activated in the story that we can use.
1c. Another note on my guess... I think another possibility with release drawing near is maybe they do not give us a new class, but rather some new subclasses as to save some bigger things for full release.

2. More updates to cinematics, visuals and the UI. With release getting closer these are only going to get better.

3. More character creation options like hairstyles, body types, etc. This is another thing that makes sense to me closer to release.

4. Enabling the option to pick alternative, but close classes for companions. For instance you will be able to pick if Gale is a Wizard or Sorcerer.