The U.S. sent 2 age-eligible senior pairs from 2007 Nationals, Namiotka/Coughlin (4th at 2006 & 2007 Jr. Worlds) and Moyle/Seitz (2nd at '06 Jr. Worlds, 5th in '07), along with the 2007 U.S. junior champs, McLaughlin/Brubaker (won JGP Final and '07 Jr Worlds). These 3 teams had qualfiied for the JGP Final in December 2006, along with Paetsch/Nuss (3rd in junior at '07 Nationals and in the JGPF) and Pflumm/Pottenger (4th in junior at '07 Nationals). Paetsch/Nuss, Pflumm/Pottenger and Butler/Jacobsen (2nd in junior at '07 Nationals) all will be back on the JGP this fall.
ETA: I noticed that the article's photo caption has been revised to clarify that they are at the junior level (the article's first paragraph doesn't specify their level): "Figure skaters Kaela Pflumm, 16, and Christopher Pottenger, 20, placed fourth in junior pairs in their first year together at the 2006 U.S. National Figure Skating Championships."