The Leica Q has been officially announced by Leica: Leica-camera.com. I will keep updating this page with links to preorders and reviews:
Preorders:
BHphoto (Click here), Adorama (Click here).
Previews, reviews and hands-on:
Review by Ming Thein. Review at ThePhoBlographer. French test at Lesnumeriques. German review at SystemKameraForum. Review at LaVidaLeica. Hands-on at ePhotozine. First impressions review at Dpreview. Hands-on at Dpreview. Image samples at Photographyblog.
Press:
Official German Leica Q page. English press at ePhotozine. German text at SystemKameraforum. English press a LaVidaLeica.
Extra:
Q&A with Alex Habermehl at Leica Blog. Q Accessories at Leica. Q Tech equipment at Leica.
Interview:
Video interview at Luminous Landscape.
Discussions:
Leica Forum,
Apps:
Q app at iTunes and GooglePlay