yes its GPL.

His code can be found here: http://repository.maemo.org/extras-d.../f/freemap-il/

and the latest code from Waze can be found here.
http://www.waze.com/wiki/index.php/Source_code

btw, in case we port the latest waze, i assume we need to create new graphics and resources since the ones they use are proprietary.
am i right?