this is the response i got from the xbox people..........Regarding your inquiry, we have a team of some of the best developers at Microsoft® dedicated to working on this. They are currently working on the next round of titles, and will update the emulator when dev and testing is complete for the next batch of titles. We're not announcing any dates, because we honestly don't know how long it's going to take to do the next series of titles.
Please check the website,
www.xbox.com, for any future updates. Thank you for understanding