The Japanese DC Watch has reported today that Pentax has updated at their Japanese website for more concrete information about the upcoming 645D (just a little bit):-http://dc.watch.impress.co.jp/docs/news/20100302_352104.htmlThese include the 645D sensor will be about 1.7 times larger than a 135 full frame one (in area) and that it has dual SDHC slots (still not SDXC compliance? :-() that can be
