Is there anything in the object model that will indicate what the coordinate "bounds" of the about-to-be-rendered map are going to be?

I'd like to store (and pass along with the rendered map for use on the JavaScript side) the coordinate boundaries of the map.

Is there anything that will tell me what the rendered Minimum Longitude, Max Longitude, Min Latitude, and Max Longitude will be?

Thanks! I'm striking out on the MapSpec object thus far.