Not some much the aircraft as the equipment fitted that will be approved for GPS Non Precision Approaches.
We install things like GNS430/530 etc in GA down in Bournemouth, UK and recently we have been able to add GPS NPA to the list of other IFR certifications (Like BRNAV enroute etc) that our installations include. For UK operations this CAA document might help:
www.caa.co.uk/docs/33/CAP773.pdf
It lists the minimum requirements for the equipment, and the type of installations that can be certified. Aimed at the private / GA sector but might offer some info.