Ricoh official samples:
DPReview samples gallery (a lot of images! man..the ISO1600 from A12 is so freaking good!:D)
DCFever - warning, these two sets of shots will make you want GXR! Most of these were taken with high ISO and they look INCREDIBLE!
Japanese preview with many samples
CNET Germany samples Full scale photos can be seen clicking the "hier" link in "Das unbearbeitete Originalfoto gibt es hier" sentence.
Some Flickr GXR streams (full size photos)
hirosan's photostream - Some GXR A12 shots - look at ISO1600/3200 shots!
Park Cameras' photostream
dkamera collection of A12 sample images (German)
Photographyblog GXR side by side with GF1:
Quesabesde preview - Spanish
Which.co.uk - video preview
WhatDigitalCamera.com - video preview
Stanley Young's interview with president of Ricoh Personal Multi-Media center and GXR designers:
(Goggle translation from Chinese) It's well worth reading despite the somewhat hard to understand translation! You will for example learn why it took so long to implement HD video in Ricoh cameras (currently only in A12), what is the planned durability of slide-in mechanism or an inside look in GXR design process.
(Goggle translation from Chinese)
CNET Germany preview (thanks Gerd!)
It's very good to compare these ISO crops form both A12:
Another (Japanese) A12 preview with full resolution samples:
DC Watch GXR review (Japanese)