Far Cry 4 - The arena mode trailer

Well, at least he doesn't need to worry about his back problems anymore.
Now i understand why people talked a lot about Far Cry 4 at PAX Prime. And it´s spelled "The arena mode". Which made me think about my days as a action Quake player (the intense close combat experience). But Far Cry 4´s arena mode will offer both tigers, elephants, traps and all kinds of things.
And it would be really, really cool if Ubisoft added a crossplay feature for Far Cry 4. Because many players would love to see a PS4 Vs Xbox One Vs PC players battle happen. Maybe Ubisoft won´t be able to add that before Far Cry 4 get´s released (which would be on the 18th of November).
But perhaps Ubisoft could add a crossplay feature via a update or DLC?