I think these are all instances of adding grape juice to the must before making beer. Chardonnay is a popular adder.
This might help alleviate the overplantings of grapes in some areas. It might introduce more-complex flavors than merely making beer with water.
Read about it here.
And here are Blue Moon's wine-beer hybrids:
These are: Proximity, "wheat ale brewed with the juice of Sauvignon Blanc grapes," and Impulse, "wheat ale brewed with the juice of Cabernet Sauvignon grapes."
