I would like to first point out that I am new to hacking and coding in general but I was wondering if this is possible. I was wondering if there is someway of finding what URL's Google Now queries to get what cards to show, etc. and if it would be possible to somehow use this to build extensions for web browsers, enhanced Google Now apps or even expanding Google Now to other platforms.
Re: Google Now
Not sure, Google did release source code for Jelly Bean (contains Google Now) so you might want to poke through that. - source