There are several types of creatures in the Rift: Planes of Telara gameworld setting. This list will evolve over time as more information is released.
So far it is known that there are fire and earth elementals.
Creatures which look like goblins or orcs are in the game, in addition to Ettins and trolls.
There are a number of insect-like creatures, although not all are named yet.
A number of strange creatures can be found in Rift, which we have not yet found a suitable category.
Pictures of undead can be seen in the trailer video, and mention of skeletons, zombies, and a lich is made in various E3 previews.