Found a link to the Pentax K20d's possible counterpart, it's around halfway down the page.
Aronsen AS
They are discussing it over at Steve's Digicams:
Samsung GX-20 specs and pic surfaced - Pentax / Samsung dSLR - Digital SLR Cameras - Steves-digicams.com Forums
Looks good, 14mp, ISO3200, and a PC sync.
Matt