This is a quick question to ask, but is there anyway to print preview before you print?
If you mean, Is the typography WYWISWYS What You See Is What You Get, then the answer is yes always.
If you mean, Is the photography WYSIWYG What You See Is What You Get, then the answer is yes, if you know how to use ICC colour management in general, and if you know how to specifically use the implementation of ICC colour management in the Mac OS X system level services.
From fifteen years of writing manuals and public support posts, experience suggests that endusers most often object to ICC colour management because they can't see the point of simulating a low gamut printing process on a high gamut studio inkjet or studio display. That, and setting rendering intents, too.
To do what you want, you have to do it per photograph, independently of the photograph you placed in Apple Pages. To softproof a photograph, locate and launch the Apple ColorSync Utility, locate the photograph in TIFF or JPEG format, open in the Utility, and select your rendering intent and destination colour space. If you start with an image in RGB data space, first convert into the colour space of the printing condition using Perceptual (you can use Relative Colorimetric with Black Point Compensation, but Black Point Compensation is a non-ICC implementation by Adobe for backward compatibility with PostScript). When you have the photograph in CMYK data space, the profile that was your destination now becomes your source. To softproof that on the display, use Relative Colorimetric (without paper white simulation) or Absolute Colorimetric (with paper white simulation). By definition, a proof is never done with Relative Colorimetric and Black Point Compensation, which you should thus disable in the second transform.
/hh