Nebelhorn is a senior ("Senior B") international. I assume that Igor Shpilband wanted Belbin/Agosto and Stiegler/Magerovskiy to have a test run of their new programs under the new judging system before Skate America.
2005 U.S. junior champ Jeremy Abbott's official site: http://www.figureskatersonline.com/jeremyabbott
This is Abbott's first senior international, as well as for Shaun Rogers (not including his appearance at the USFS cheesefest this past April), Chloe Katz/Joseph Lynch (2005 U.S. junior pair bronze medalists) and the new pair of Tiffany Scott/Rusty Fein.