Atlanta - New Terminal - Connecting Luggage

I have a nine hour stopover in Atlanta later this month, I am flying with Delta from Dublin and presumably arriving in the International Terminal. My next flight, on the same ticket, is a domestic journey in the evening, again with Delta.

I am planning to make my way in to town for a few hours before returning to the airport, and as such I don't want my checked luggage weighing me down.

I have researched the wrap-a-bag luggage store within the terminal, and also into simply rechecking my luggage as soon as I arrive, but with the brand new terminal now open, do I really need to do any of that? Will my bags just automatically head off ready for my next flight?

I read that the new terminal negated the need for passengers to recheck their luggage. Would this apply to a nine hour stopover?

Thanks for the help!