First up, the new system used by Bing search is faster, getting the job done half a second quicker than in the past. The faster processing means that “streaming” recognition is now possible, showing you what you’re saying word-by-word, and thereby offering search results in less time.
Accuracy is also up, and Microsoft says there’s about a 12% improvement in error rates. Those improvements could be even more significant by the time the new system launches, maybe even gaining another 15% in the process.
Some of the changes, like a move to new servers, have already begun to be implemented, but it could still be some time before all of this is available to Windows Phone users.