Rumors are already circulating that besides the expected Apple iSlate tablet device, we may also see a new version of Aperture on January 27th. Aperture 2 was released back in February, 2008 and is due for an update.
There was this rumor few months ago about a new Aperture 3.0 book that was quickly removed from Amazon:
"The book is listed as "Apple Aperture X (3) - UNDER NDA: A Workflow Guide for Digital Photographers," and the 320-page paperback from Focal Press has a release date of May 26, 2010, perhaps suggesting a timeframe for the forthcoming software's release. The forthcoming book's ISBN number is 978-0240521787."