I haven't seen any yet. I believe it's been determined the WM ST "full synthetic" is actually Group III based oil. What was the price on it? If $3/qt or less, it's probably a decent oil for the price. If the price is near Mobil 1, my advice would be to pass it by.
I've seen it up here in Canada at our Walmarts too. I noticed it there about 3-4 weeks ago. Although ours just said high mileage, and mentioned nothing about being synthetic.