This, as you can read from the article, is much more than a soundtrack. Skeptics will quickly see how innovative the integration is.
Also, from the ESPN article.
We're eager to share all the improvements in the near future. I think you guys will be quite pleased. Dev's have been all over the gameplay; and as we learned from the E3 Kotaku article, their work on 2K13 began the next day after 2K12 released.