I expect a lot more merchandise featuring Nintendo characters like T-shirts, K'nex, and figurines. This actually started before the official announcement. I do not expect cartoons or comics being outsourced according to what I've seen, if they are I'd expect close oversight from Nintendo as they don't want their franchises to lose value. For example, Nintendo no longer wants Mario portrayed as a plumber or Peach called Toadstool. I'm not expecting a mature Mario game either.
I also expect to see more ads like the Chicago train, but more focused. I hope they have more sweepstakes and contests.