Well I'd say that it means that GPL is a more respectable league to play in, will have better sponsors, tournaments themselves will be better then ever before and the atmosphere will be more competitive.
basically the GPL is now a mini NPPL event. The GPL will be apart of the NPPLs marketing which will help to draw more sponsors.
Also in the near future we are working on a system where the GPL event points will count toward your NPPL rankings. And the future plans is that the NPPL will be an premier event where teams will need to go to an offical feeder series in order to sign up for an NPPL event.