Minolta DiMAGE Z6, see:

 http://www.minoltaphotoworld.com/cms/984.html?&L=1

(registration required).

With no definitive specification, it looks like they put a 6MB sensor into
their Z5.  One interesting note is that it claims compatibility with
alkaline batteries:

"Your picture-taking fun lasts even longer with four Ni-MH batteries
(2500mAh) that can power the camera for up to approximately 420 shots.

Offering this extra dimension of choice, the Z6 is fully compatible with
widely available alkaline batteries, which gives a shooting capacity of
approximately 240 shots per battery set."

David