Slugger's site says: No secrets for you!
This morning I jumped on the JP Mario Super Sluggers site just to check if they had updated anything, when I noticed the “Modes” section of the site had removed the screenshots that showed off secret characters.
For awhile I sat here wondering if perhaps I completely lost my mind obsessing over the game and just imagined I saw King K. Rool, Wiggler, etc. It turns out Nintendo actually went back into the site and swapped out the screenshot that showed all the hidden characters, with one that shows none of them.
Thankfully RMC from GoNintendo took a screen grab of the site back on the day it launched. Check out the before and after shots just below.
June 5th (Site Launch)

Now (June 12th)

–Josh
[...] our Mario Super Sluggers coverage very closely. They didn’t think that GoNintendo and WiiFolder would obsess over tiny roster screenshots! They didn’t think that character rosters would be [...]
thanks josh your awesome as always.
im pissed of rite now
hey josh could you do a tour on little kings story? when it hits japan?