Microsoft released a new pricing model to partners that will take effect October 2012. The pricing model will move all users to the new licensing model.
There could be a cost for the user to migrate to the new licensing model. The transition is based on the list price of the new model and subracting your protected price list. This transition only applies to users that will be upgrading to GP2013 and the new version of NAV2013. If you are planning on upgrading to either of these versions you should contact your partner to determine if there will be a financial impact.