High-level players can venture to the Isle of Souls for solo or small-party play, take on Pagan's Temple for solo or group play, make a small team to infiltrate Nornil's Cave, or take part in the daily instanced raid of Nornil's Garden. Meanwhile, all players can enjoy the revised Mentoring and Reputation system, while players with a Subclass can enjoy special dual-class abilities as well as a free subclass level reset. And there's a whole revamped system of Clan Wars coming, complete with contestable halls. Really, if you're an avid Lineage II player, you might want to just look at the site.
[Update]: Glory Days will launch on October 24th.