Well like I always say (which only really applies to Nintendo).
If Nintendo hasn't said it, assume it's fake. I really ONLY tend to truly believe something, if and ONLY if it is announced by Nintendo. That means it has to be directly from Nintendo.
None of this "A *cough* trusted source *cough* who works *cough* close to Nintendo *cough*" lark.
Seriously the things people will believe. If I saw this topic first, you know what I'd do? I'd actually search for it on Google, and find out if it's true, not just believe a random forum post. I mean seriously, why would a random thread/topic in a forum be the first person to post this? It would have been already known and posted on more official pages, wouldn't it, or at least anywhere before some random guy.
This is how gullible people can be....http://nintendo3dscommunity.com/index.p ... alaxy-3ds/
To be honest, I'm surprised no one (from magazine sites) managed to pick that up and start posting news about "OMG SMG 3DS?"