The official site is “under construction” Election Commission of Pakistan
But here are some links, Ill look for some more as well
Most of these links are by non-muslim minority rights groups (only Hindu, christian & Sikh) containing lots of other information as well, but they all refer to “minorities winning the right to vote and run in general elections, and not only in reserved seats.” The biggest Ahmadiya group of course does not accept their disputed status as a minority to begin with so further discussion of minority rights is void.
But here are some links, Ill look for some more as well
The Hindu : Equal voting status for Pak. minorities
rediff.com: Pakistan scraps separate electorate for minorities