Heh I always thought the underground after the hidden boar scene before going to the desert was gonna be for part 3, but I guess I was wrong and it'll be on the 3rd game... Can't wait to see what's coming on 3rd part!
I should clarify terms just in case there's confusion here: more boar scenes (and other carry-over scenes) are planned for the THIRD GAME, or CHAPTER 3. They won't be a part of the third CONTENT PACK however. I THINK that's what you're saying, just wanted to be sure.