This is the new 6 series model.
Clearance model TX-NR616 currently $780 on JB's website, and from what I've read the 616 is not a good amp.
The 626 has been given 4 stars on What HiFi review - http://www.whathifi.com/review/tx-nr626.
Amp has built-in wi-fi plus plenty more -
Part of Bing Lee's 4 day sale.