the fruit we're planning on trying this August is the pawpaw. we'd planted cornelian cherries, but it was difficult to process it - mostly pit and the flesh didn't come off easily.
For a southern grape muscadines come to mind and Scuppernong which is a variety of muscadine. A friend of mine has muscadines on his pine straw farm. I hope to get out there when they are ripe and get a bunch, but I have to beat the deer to them. I hope to try freezing them. I have been using store bought grapes frozen and they are an awesome treat. Can't eat to many in a row, brain freeze or tongue freeze.