It appears that the Destiny juggernaut is continuing with today's PlayStation 4 and XBox One release of the Rise of Iron expansion, enough so that servers are overburdened and players are reporting they are being put into queues on logging in.
Destiny: Rise of Iron requires players to own The Taken King in order to participate in the story campaign that includes new gear, a new 6-player raid, cinematic stories, a maximum Light increase, a new Strike, the Plaguelands Zone, the Social Space, new Crucible Mode and maps and a brand new enemy faction.
Learn more by visiting the Destiny: Rise of Iron site and keep tabs on server status by heading to the Reddit link above.