http://www.9to5mac.com/17896/Is-the-iPad-going-Retina
They have already told developers to include high res images - so YES they can have a SLIGHT res bump, then use the @x2 images for it so it will look OK.
The icons are displayed on a pixel-for-pixel basis, so if those docs you point to are implying "x2" that would be double the current resolution, not "x1.2" or "x1.3" the current res, which is what a "slight" bump would seem to imply, yes?