Yes but on the app it says that the advantages to playing battle royale are (1) bonus leaderboard points for the top three and a significant bonus for the victor , the implication being that the victors get something different
Since it says "Significant", I think it will be something pretty cool. Not just a patch. I'm thinking it will be something that will make people want to play in that bracket next clan war. Not sure what it could be however.
its a exclusive vulture patch, given to any clan that entered the BR in the TOP TIER that scored at least 1 cp, and for the winner only of the BR in the regular tier. its on the news section of the app.