The new instances are Halls of Night, and Inn of the Forsaken. The former is for players level 40 to 65 and sees the players trapped in in a dangerous dream realm by the devious Barrow-wight Nightmare. The players must battle their way through this living nightmare to defeat the evil that inhabits it in order to earn their freedom. The latter is for players from level 20 to 65 and has players investigating rumors of strange occurrences at the aptly named Forsaken Inn. The new skirmishes, Attack at Dawn and Icy Crevasse, are for levels 30 to 65 and 40 to 65, respectively, and pit the players against a variety of threats in the defense of Esteldin, Evendim, and ultimately, the whole of Middle-Earth.
If you want to get in and help defend (or destroy) the Free Peoples of Middle-Earth, you can sign up at the official site.