Not much thought went out for the name of the district but at any rate we have a new place to explore, jobs to do, and rewards to unlock! So get to it as there is a limited amount of time to complete it! as usual, ~14 days depending on when it actually went live to your server..
Make sure you stock up on the consumable required before leveling! It will save you a lot of heart-ache later! You will need a total of 148 Horseracing stubs to clear the district all the way to ruby mastery.. So get to it and use your city boosts wisely!
When all is said and done you will be walking away with this fine mastery reward! The floating casino!