GKMLTTSB
Smash Ace
All of the companies are fairly tight-lipped, and it's usually a stupid mistake that leads to official leaks.You know I struggle to think of another company that would be this tight-lipped about something that isn’t Disney.
The only other company I could think of is Sony but I really struggle to think who Nintendo would choose from them tbh.
The unofficial stuff dropped by leakers seems to always follow one the above mistakes or falls immediately before the announcement anyway. :-\
Could be Disney, could be Bamco, could be Nexon or NCSoft. Silence isn't really much of an indicator.