It's not some sort of spite thing. It's just that on current generation consoles, the most sizable base of active digital consumers has been on the X360 and PS3. Bear in mind, this game was green lit more than a year ago when I did the deal with Marvel. Don't worry though, on some future unannounced Capcom projects, Nintendo platforms will get digital love from us. :) - Capcom's Christian Svensson

Let's hope this means both Wii U and 3DS. I mean, he did say 'platforms'. Thanks to JF for the heads up!