Nope, at ufc 126 post fight press conference, Silva mentionned the obvious choice of Brazil or otherwise the neutral grounds of Vegas, his ''home away from home''. While Dana white said that the biggest challenge to this fight would be to find out where it's gonna be.
I took more to me what venue will be worthy of hosting such a big fight. I can't see Silva minding going to Canada - its not like he's going to get cheered in Vegas any more than he is Toronto. Now I'd have it in the Cowboys Stadium but I'd be surprised if Silva goes anywhere other than where makes him the most money.