Yes, the personal assistant to Master Chief. Many of Cortana's voices are also voiced by Jen Taylor and I believe eventually most of them will be.
Some of this intelligence will come to Bing in the coming days -- I'm not exactly sure which parts, but some of the inference aspects at least.Nice article, really shows how much voice assistance really has evolved over the years. I would be interested in seeing a version for desktops, and how the combined use would effect the performance of the service. Having a service that uses the same dataset to understand my voice while pulling relevant information based on my platform would be really interesting.