It doesn't end with a cliffhanger, just somewhat of a tease, the 100% ending of the original Prime is closer to a cliffhanger but still isn't there.
Halo 2 ends with a cliffhanger, Resident Evil Outbreak ends with a cliffhanger, Avatar season 2 ends with a cliffhanger.
OT: It needs more boobs.
It's a cliffhanger.
"A cliffhanger or cliffhanger ending is a plot device in fiction which features a main character in a precarious or difficult dilemma, or confronted with a shocking revelation at the end of an episode of serialized fiction."