It looks like some recent trademarks could give us a clue at some more games that Nintendo is working on.
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Maybe a Mario Tennis on mobile next? Nd Cube is surely working on a new Mario Party, IS always starts on the next Paper Mario after the current one finishes, Where due for a new Dr. Mario title and I guess Next Level Games could be working on a new Punch-Out over Luigi's Mansion 3.
My Nintendo News wrote:Nintendo Co., Ltd. has filed some brand new trademarks for various IPs. According to Japanese Nintendo, Mario Tennis, Mario Party, Paper Mario, Dr. Mario and Punch-Out!! were the ones mentioned. So why does Nintendo want to trademark these? Japanese Nintendo says that “all trademarks are for purposes of ‘video game program’ and ‘downloadable video game program’”.
Source
Maybe a Mario Tennis on mobile next? Nd Cube is surely working on a new Mario Party, IS always starts on the next Paper Mario after the current one finishes, Where due for a new Dr. Mario title and I guess Next Level Games could be working on a new Punch-Out over Luigi's Mansion 3.