...Yeah, it's not like the upcoming updates post mentioned "Duel him and win to obtain new Reward Cards!" at all, or that every single repeat event has had at least one or two new cards at all. What makes you think this one won't even though they said it would?
The current list posted is from the first iteration. There have been no leaks as of yet, so they haven't updated the possible rewards list.
Even if there are new rewards, it'll be a rehash of the same BS we got last time: Subpar cards, subpar character story, subpar event...so in a way, it will probably be the same flaming turd in a new bag.
We don't know what cards he may give which are new until the game updates. This will probably be true for the majority of repeat events as an extra incentive to play them.