A bit of a curiosity question regarding Tamron releases. It seems with the recent releases they're made available for Canon mount with the Nikon mount releasing an undisclosed amount of time afterwards. The 24-70 VC took some time to be available for Nikon mount and now it seems the 70-200 VC is following the same path. Does anyone have an idea of the time frame it takes for the Nikon mounts to be available? I'm looking at 70-200 options and the reviews of the Tamron are coming in good. Customer service has replied with a "No clue" response.