Nintendo Co., Ltd. has applied for trademarks for The Legend of Zelda: Spirit Tracks and Mario Vs. Donkey Kong - which isn't massive news in itself, as the company is forever renewing its trademarks to cover older IP.
However, what makes these two near-identical applications interesting is that they cover ‘program for home video game machine’, ‘downloadable video game program’ and ‘program for smartphone’.
Both titles are already video games (obviously), which explains the first purpose. The second one could relate to a potential digital download release. The third is perhaps the most interesting, however, as it hints that we could - could - get smartphone versions of both titles, or mobile titles based on these games.
Of course, trademarks are made all the time and often don't amount to anything, but it's interesting to speculate what these two games could look like on a smartphone. Both feature interfaces which could easily be adapted to the touchscreen (especially in the case of Spirit Tracks, which made excellent use of the DS touchscreen), so you never know.
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