Still to come is a plan to make it easier for professionals in any of the three countries seeking temporary work permits in any of the others.
http://www.crosswalk.com/news/1337561.html
Currently, the U.S. and Canada have two pilot projects for frequent cross-border travelers: NEXUS for airline passengers and FAST for land crossings. The plan is to extend this to maritime passengers (dubbed the SENTRI program) and to have all three "trusted traveler" programs cover all three North American countries.