In Skyrim, what is the third official High Res Texture Pack module for?

I found the answer -

Its for DG and DB, it also contains vanilla HD creatures similar to the first.

In more detail:

• No Hearthfire textures.
• Some Dawnguard textures (mostly related to creatures)
• Dragonborn textures!
• Some base vanilla game textures, such as new high res face textures for all races and sixes, as well as textures for common creatures (bears, deer, elk, so on)!

It's mainly for the expansions. This is the reason why it was hard to tell exactly what it does and why loading it doesn't necessarily give an answer: if those packs aren't installed, it will be a lot harder to notice.

From:

http://www.gamesas.com/patch-highrestexturepack03-esp-t309726.html