Unfortunately the section chosen was too close to the nearby neighbors who complained that the noise was "driving" them crazy. As a result, Honda ended up paving over the grooves on September 23rd. Rumor has it that they are looking for another spot to try this out again. Here is a UGC video of the road section and what the effect sounds like:
Despite the glitch with the neighbors, it seems like Honda was able to trigger the viral word of mouth. A quick search on Youtube with the keywords "Lancaster Music Road" yields 40 hits.