"Not sure how I feel about the possibility of moving up the level cap"

read it again please....

"Yeah, we've definitely got plans for all of that, a lot of our plans extend well beyond our current level cap, just in case ... it's good to design the things with the glass ceiling there"

Ok, to me I interpret that as him saying, 'the best way to design a game is to keep all the code created DYNAMIC'
That does NOT mean in an expansion they are going to up the level cap, it just means if the time ever comes, IF the time comes then the game code already in place to allow expansion