I've actually seen quite a few, I know antscanada had one, Lazarus who is also form Ottawa has several large colonies, and I know canadian anter has a decent sized one too.
I have a few (poor quality) pics of two of my 5 older C. Novae colonies. Both are packed and the outworlds have at least another half of what ants are in these pictures. I created a 'crude' and counting piece of software last year and am still working on it so hopefully I'll get an accurate count on some of my colonies soon. I estimate my largest colony to be more than 300. I actually hooked up a second new formicarium this past weekend to handle the obvious overflow (pics soon).