ZodTTD is working on a port of N64 for the iPhone 3GS and the iPod touch 3G.
The port is being developed for these two models because: - They're the fastest Apple handhelds in term of raw CPU performance. - They both have a faster GPU (Graphic Processing Unit) which allows for OpenGL ES 2.0 specifications.
So yes you may soon see N64 on your favorite Apple device. But I can't promise it will run games top notch just yet, as things are too early to say. There's hope though, with a 3D accelerated graphics plugin, as well as an ARM dynarec. If you have a previous generation device, I can use software rendering, but it will slow things down further, along with the slower CPU.