I'll say congrats now eventhough you're waiting to hear back.
You will be a graduate student so you should not confine yourself to hanging with the undergraduate Greeks on that campus/surrounding campuses. It's cool when you are just getting to know people but the novelty will wear out.
Get to know your fellow graduate student Greeks and alum Greeks in that area.
Build up your networks so that you can remain involved with your fraternity, the community, and get to know about people and events in the area. I do not know if you will remain financial with the national body but that is another way to maintain your ties and get in touch with your local graduate brothers.
Good luck!