I have both 404 and 644 D/S CCM's and can't fault them. Have always considered changing the 644 up to adventure spec but getting the right bits to fit is an issue. This 450i could be the answer however there are a lot of questions that will only be answered once more detailed specs are released.
An adventure version will require (in my opinion) - wide ratio box, increased oil capacity and service intervals, greater fuel capacity than the trail versions 17 lts (up by say 7-8 Lts), comfortable seat and ride position, robust gear carrying capacity, a bit of rider weather protection and perhaps an enclosed chain just for the hell of it. Beware CCM - cost will make or break this bike.
As for it being released in Canada and or the America's, well, with the interest shown on the likes of here, lets hope the companies involved are 'listening' to both the specs required and potential demand.