RuneQuest 6 has been available for over a month now, actually, but I’ve only recently started posting again, so apologies for being late.
Until 2012 August 22, you can obtain the book and pdf together for 50 USD! Just go here. (After August 22, the price increases to 62 USD.)
Here is a video preview of the book.
The free Game Master’s Pack and Character Sheet are available for download here.
Plus some reviews and first impressions:
A batch of DriveThruRPG opinions
Sorcerer Under Mountain