Preorders:
In USA at BHphoto, Adorama.
In Europe at Fotokoch, Foto Erhardt, Calumet DE, WexUK, Park UK.
Previews and info:
Product page at Sony. First look at Explora. Test at Adorama. Full review at Photographyblog. Full review at Lenstip. Full review at ThePhoBlographer. Previews von Fotokoch.
Video reviews: