NintendoLife reports that Ed Boon, creator of the Mortal Kombat series, has stated that there is a zero percent chance that the SNES Mortal Kombat games will ever be available on Wii U Virtual Console.
— Ed Boon (@noobde) May 4, 2014
Boon did not state why the games will never hit Wii U. There is speculation that there is a licensing issue, but there is no konfirmation of this.
Back in 2011, Boon did an interview with GameTrailers wherein he expressed his interest in making a Mortal Kombat game for Wii U. He did not specify whether this would be a new game or ports of old games.
Krappy luck. Many who were growing up in the midst of the Mortal Kombat glory days (such as myself) would love to have a chance to download these games for Wii U. Fortunately, there are other ways to obtain them (such as Steam).