Samsung has officially announced their next Unpacked event for August 13th in New York City. We're likely to see the Samsung Galaxy Note 5 and Samsung Galaxy S6+ at the event.
http://www.theverge.com/2015/7/27/9050305/samsung-unpacked-2015-new-york-august-13th
http://www.theverge.com/2015/7/27/9050305/samsung-unpacked-2015-new-york-august-13th