Something I just noticed: When LR creates the virtual copy for soft proof adjustment it adds the printer and profile name - very cool (and critical information). But, shouldn't it also add the rendering intent to the filename? Otherwise one is going to have to either remember.. or check again before making a print.
If you 'create a saved print' of the virtual copy in the Print module the rendering intent selected 'doesn't stick' to the file either. If it did it wouldn't matter so much that the rendering intent has not been included in the file name. Have I explained that well?
The reason Lr 4 Beta stores the render intent is because the render intent affects the image rendering (sometimes to a large degree, depending on the profile). This in turn influences the output-dependent edits that you make, based on the soft proof preview.
The good news is that Lr 4 Beta will not only remember the render intent, but it will also apply
that render intent when you go to Print module to print the image. I acknowledge this is not obvious, but the tooltip for the Perceptual/Relative Colorimetric buttons in the Print Job panel explain that "Proof copies matching this color profile will use their own intent." That way, you don't have to be burdened with remembering which intent you used for a given proof copy. Lr 4 Beta will take care of that for you.
Note: this also means that if you have a batch of images you want to print (e.g., 10 images), and you want to print some of them with relative colorimetric and others with perceptual, you can now do that in a single print job. Before in Lr there was no way to do that.