Most devs will take the easiest route, just as they ignored DS/3DS touchscreens, as they ignored Wii U Gamepad, as they ignored Kinect/PS Camera, as they ignored PS4's touchpad, as they ignored Vita's touchpads.
A few would make some great software and Nintendo would do some great things with it. And, imo, that would be enough to make it, at the least, memorable, as with games that utilized DS/3DS features, and so on.
I genuinely cannot see any real world application of haptic feedback that would be considered interesting.
Placing a button anywhere on the screen...what's the point? I mean, at the end of the day, it's just a button on a pad. What's the point of haptic feedback?
Yeah, most third party and probably even first party will put buttons right below the right stick.
Where else realistically can they put it?
I dont think this will be haptic feedback because the sticks make it incredibly hard. I mean, if this was a slab of a screen with no sticks, I could see haptic feedback for a universal TV remote, that can also become an iphone game controller, or a braille reader.
But those sticks make it awfully hard to imagine any position other than "Standard Gaming Controller, Place thumbs here". In which case, there is no "hook" here for Nintendo. It's just a reimagined WiiU controller. Not a bad thing btw, but this haptic feedback thing makes no sense to me.
I'm still thinking that those are physical A and B buttons, and that the rest of those buttons are simply underneath the touchscreen.
This means these buttons can be pressed, but their display can also be changed, since it's underneath a screen.