First Look: Mega Man X iOS
You can probably see what's changed from the SNES version.
Famitsu.com managed to get exclusive first pics of the iOS version of Mega Man X. Take a look here:
The site says that the iOS version is based off the current feature phone version of the game. In addition to touch panel support, it adds GameCenter support for a ranking mode. You'll find 80 challenges for showing off your (touch screen) Mega Man skills to the rest of the world.
Mega Man X iOS will be released this month.