If that's the case it seems funny that they aren't bragging about it, answering direct questions about this or providing Photoshop printing plug-ins like their competitors are so that people can take advantage of it.
You'll see that messaging particularly with the newest printers this fall. The fact is, the only known apps that can even send 16 bit data to the print pipeline is Lightroom and Aperture (and Preview).
So, it's not like the printers can do much if that apps can't send the data, ya know? As far as making Photoshop export plug-ins to print to the printers, the problems with the Canon plug-ins are an indication that doing that ain't easy...