In the Destiny 2 gameplay premiere, a gameplay clip of a warlock's inventory shows the glimmer count and another currency, probably legendary marks. Anyway, the numbers on them might reveal when the Beta is active. The guardian has 17177 glimmer, which may mean July 17th 2017, a possible Beta date for the next game. The legendary marks (98) probably signify the month and day Destiny 2 comes out as well. We all know Bungie loves their easter eggs. Also, credit to instagram user maly1242764