Just go buy it if you want it. Know it is rare enough you won't see another for 18-24 months in the entire US. I've seen two up for sale before... since 2009.
Probably exactly like the current Legacy model. Refresh will be minimal (and they may wait till year 4 of the current gen) and the next Gen is due 2020.
VW can't keep enough cars on the lot they're still selling so many. With the diesels off the table people are just buying other VWs. Sorry, people as a mass just don't care about emissions. They'll just keep buying whatever they're comfortable with. It's sad but true.
Press release on this? Just like the LGT and Legacy STI all we've ever seen as official comment is "Never say never." and "Not for US... for now." which leads to literally never hearing about the product again.
New or old NSX?
It's not a true Polestar model, just the factory tune added to a stock vehicle. $900-$1500 depending on the model, it's across the board on almost every engine they offer.