I received a tip that the September 2009 edition of Résponse Photo, a popular French magazine, that the Canon 1D Mark IV would be announced on August 25.  That’s Tuesday for those of you who don’t have your calendar handy.

I looked around the Interweb and couldn’t seem to find an online presence for Response Photo, other than the publisher’s site.  However, a poster on the Spanish forum Ojo Digital corroborates this tip and provides a little further insight as to what’s in the issue, including tips on the Nikon D700x or D800 and Sony’s new Alphas (via Google’s automated translation):

– A Nikon D700x (or D800) that should be the D3x what the D700 to the D3 (Sensor Sony 24 Mpx).
– One that replaces the Canon 1D Mk III … (anunciada el 25 de agosto) (announced on August 25)
– A Pentax entry-level …
– Three Sony models, two bodies twins who come to fill an empty space range today and a third that seeks to satisfy the fans who consider 24×36 expensive current models be announced on August 27 and will hit stores on September 15 . . . announce a complete test in the October issue.

Rumors of the Nikon D700x have been rattling around for a long time now (pretty much since the Nikon D3x was announced December 2008).  I’m skeptical that Nikon has such a camera planned this soon after the D700, but I’ve been wrong on these feelings before.

The Canon 1D Mark IV sounds plausible; however, that date is inconsistent with other rumors we’ve heard.

A replacement for the Pentax K2000 seems a little quick as well, but manufacturers seem to be shortening the product life cycle more and more.

The three Sony models sounds like the real deal though.  I think that the reference to the 24x36mm shooter is clearly the Sony A850, which has all but been announced.  The other two that fill a new slot in the lineup is likely the Sony A500 and A550.