Just a little note. I did take some cuttings from the plant, about six of them, even though it's not the perfect time of the year to root blueberries. If they are determined to be blueberries, which I believe they are, then I could plant some of the rooted cuttings near my other 'tame' blueberry plants at my other place for pollination.

It could be a wild Vaccinium species, such as Sparkelberry or Mayberry.

Sparkelberry:
http://apalacheehills.com/PlantWeb/Sparkleberry.html

Mayberry
http://apalacheehills.com/Native/Mayberry.html

Here is a link that might be useful: Apalacheehills

It definitely looks a lot like the mayberry. The sparkleberry looks way too large for this to be it. This plant has stayed below 3' for the several years that I've noticed it growing.

On my land, the mayberries flowered in February, and had leaves by the last half of the month. The leaves are very bright green this time of year.

The blooms look like those of cultivated blueberries. The berries (on my bushes at least) are smaller than the cultivated blueberries, but taste OK.

The Mayberry can take a lot of shade, but will have more berries in the sun.

The cuttings I took are still looking good. They've grown a lot of leaves and a few have probably grown 2" or so. If they do well, then I will plant some in the full sun near my regular blueberry plants.