I've heard this rumor before. That being said, I see them regularly at gun shops in my corner of the world. They don't sell fast but they are out there. I picked up a nice MKIII about 3 years ago. Price isn't bad either. You can usually get them for around $900. If the rumor pans out or gains steam, those prices will jump.
It would be nice for FN to continue with limited runs every year. It has to be a major legacy item for them.