Here are a couple of spoilers on guest stars during the 17th episode of this season's Gossip Girl!
[KEITH VAN DER WOODSEN] Early 40s.. male. Caucasian, upscale. A handsome and charming commercial director. Serena and Eric’s paternal uncle. Preferably blonde. Guest Star.
[ELLIOT] Legal 18 to play 16, male. Open ethnicity, upscale, attractive. A boy living in Eric’s building with scruffy good looks and a disarming smile. Co-star, possible recurring.
Ausiello posted on his website that Elliot is perhaps meant to play Eric's new boyfriend -- hopefully we'll hear more spoilers about this Elliot soon!