The next book in the Halo series, Halo: Cryptum, is due out on January 4th. Tor.com and the Halo website have early previews. Tor.com has an exclusive excerpt of chapter one, which you can view here. You need to register at tor.com, but it’s free and only takes a second. You can read chapter two on the official Halo website.
The author, Greg Bear, is going to be touring at the beginning of January in Washington state and San Diego. You can check the details here on tor.com’s website.