Before anything Please take this with a grain of salt and remember that this is only a rumor till proven otherwise.
It appears that EB Games Australian site had posted some switch games in their site. Below you can see an image of the games listed, Someone claimed that the site had these games listed earlier and has now been taken down.
This was first seen in a threat in Reddit which you can see Here in addition shown in the image it shows that it list The Legend of Zelda: Breath of the Wild, The Elder Scroll V: Skyrim and Mario Kart 8. The Mario Kart 8 box claims that it has 24 new tracks and 10 new characters which can be seen below
I noticed this from the EB Games Australia Listing for Mario Kart 8 Switch. There's a new battle mode, 24 Extra Tracks and 10 New Characters pic.twitter.com/wbDT4COZCX
— Pixelbuster (@PixelMatt64) January 2, 2017
Like we said this is just a rumor and could be completely fake. This could be Photoshop and could be tricking us all. Then again this is EB Games Australia which has had some posting about switch whether they are real or fake. Take this with a grain of salt but we shall find out the truth in 10 days.
Edit: Turns out that this was photoshop by someone who was bored and just having a bit fun. Nonetheless it was good photoshop and now time to wait for the real deal in 10 days