I think that its quite a possibility.
Watching the CNET video about Senseg though, its talks about modifying the electrostatic field to change the friction against the screen ...
I'm wondering: If it does it for the whole screen ( modifying the field ) , does that mean that multi-touch haptic feedback is not possible? or would it be able to modulate sections of the screen so that each finger can sense something different.
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Taking that a step further, it could open up a lot of possibilities for visually impared / blind users.
Even if they do something like this, it depends also the software! It can not simply assume what goes on on the screen and materialize it. Programers would have to completely re-code their programs.
It's not an option for this iPad or even iPad 4