SmartA, The 451 is the new smart model for everywhere, not just the US. You can start buying accessories now if you want, but why not wait until the car is released here so you can get the factory accessories from your dealer, and US aftermarket suppliers can get into the smart car business.
The CDN smart has slightly different items listed as standard for each model smart, i.e. heated seats being standard on the passion. Also, the gauges are all in metric. The specs listed in the CDN brochure are, naturally, done in metric as well. Other than those few differences, CDN and US smarts are the same car.