The Undine, a shapeshifting race otherwise known as Species 8472 to the Borg, have been introduced to Star Trek Online as part of an update that went out today. Admiral ranked players can encounter the Undine in the new Undine Terradome special task force, pits Admiral ranked players against the Undine who are planning to invade Federation space.
Today's update also includes an assortment of other fixes and tweaks, including improvements to Memory Alpha, find out more by reading the full patch notes here.