Haagen Dazs Japan gave fans of their frozen desserts a chance to sample this product before its official release on July 7. On June 2, Nissin market sold a lemon ginger float flavor before the rest of Japan could get their tongues wrapped around it. It's an interesting thing to do because the flavor is definitely going to be widely released so this isn't test marketing. It's more about making something exclusively available via a particular vendor for a limited time. It's not quite the same as limited edition Oreos only being sold at Walmart (as often seems to be the case), but it's one standard deviation away from that.
This is definitely one of the more promising unique flavor combinations that Haagen Daz has come up with. The only thing about it which could be the case is that it has a little bit of an "I have a cold and this is the flavor of tea that would probably make me feel better" vibe about it. If there was some honey in the mix, it'd definitely be a (much tastier) substitute for cough syrup.