If they do it for the SL (which is still not sure), it is true that they eventually could do it for the ML.
But I honestly don't think so.
The SL is getting a bif face-lift, because it will last longer than previewed, and much longer than a normal car; and its Comand is getting really old too.
The ML will have a normal MB-FL, meaning really small. New lights and bumpers, maybe new colours, some new options, little modifications in the interior, and that's it. No big change. (yes, new motors too).
Don't hope the Comand III, you may will be surprised...

Or not.

But at least you won't be deceived...