Some interesting match-ups on both sides. For the men, it looks like a deep and fast field. I'm sure a lot of people will focus on Hall and the fact that he has the second fastest PR listed but this is a field in which Hall is one of many.
Men - Personal Best
Deriba Merga, Ethiopia 2:06:38 (London, 2008)
Robert Kipkoech Cheruiyot, Kenya 2:07:14 (Boston, 2006) CR
Ryan Hall, USA 2:06:17 (London, 2008)
Abderrahim Goumri, Morocco 2:05:30 (London, 2008)
Gilbert Yegon, Kenya 2:06:18 (Amsterdam, 2009)
Robert Kiprono Cheruiyot, Kenya 2:06:23 (Frankfurt, 2009)
Evans Cheruiyot, Kenya 2:06:25 (Chicago, 2008)
Chala Dechase, Ethiopia 2:06:33 (Dubai, 2010)
Elijah Keitany, Kenya 2:06:41 (Amsterdam, 2009)
David Kipkorir Mandago, Kenya 2:06:53 (Paris, 2009)
Benjamin Maiyo, Kenya 2:07:09 (Chicago, 2005)
Tekeste Kebede, Ethiopia 2:07:52 (Fukuoka, 2009)
Gashaw Asfaw, Ethiopia 2:08:03 (Paris, 2006)
John Kipkorir Komen, Kenya 2:08:06 (Reims, 2008)
Samuel Mugo, Kenya 2:08:20 (Beijing, 2009)
Stephen Kiogora, Kenya 2:08:24 (Frankfurt, 2008)
Mebrahtom Keflezighi, USA 2:09:15 (New York City, 2009)
Moses Kipkosgei Kigen, Kenya 2:10:12 (Nairobi, 2009)
Abdellah Falil, Morocco 2:12:37 (Turin, 2009)
Jason Lehmkuhle, USA 2:12:54 (New York City, 2007)
Cutbert Nyasango, Zimbabwe 2:13:19 (Berlin, 2009)
Alejandro Suarez, Mexico 2:13:33 (Torreon, 2009)
Josh Rohatinsky, USA 2:14:23 (New York City, 2008)
Antonio Vega, USA 2:15:45 (Minneapolis/St.Paul, 2009)
Mohammed Amyn, Morocco Debut
Women - Personal Best
Salina Kosgei, Kenya 2:23:22 (Berlin, 2006)
Catherine Ndereba, Kenya 2:18:47 (Chicago, 2001) NR
Madai Perez, Mexico 2:22:59 (Chicago, 2006) NR
Teyba Erkesso, Ethiopia 2:23:53 (Houston, 2010)
Dire Tune, Ethiopia 2:24:40 (Houston, 2008)
Lidiya Grigoryeva, Russia 2:25:10 (Los Angeles, 2006)
Weiwei Sun, China 2:25:15 (Beijing, 2002)
Bruna Genovese, Italy 2:25:28 (Boston, 2006)
Albina Mayorova‐Ivanova, Russia 2:25:35 (Chicago, 2003)
Yurika Nakamura, Japan 2:25:51 (Nagoya, 2008)
Agnes Kiprop, Kenya 2:26:22 (Turin, 2009)
Nailya Yulamanova, Russia 2:26:30 (Rotterdam, 2009)
Koren Jelela Yal, Ethiopia 2:28:41 (Venice, 2009)
Waynishet Girma, Ethiopia 2:29:50 (Amsterdam, 2009)
Tatyana Pushkareva, Russia 2:30:30 (San Antonio, 2009)
Meseret Legese, Ethiopia 2:31:37 (Padova, 2009)
Michelle Frey, USA 2:35:51 (Minneapolis/St. Paul, 2006)
Mestewat Tufa, Ethiopia Debut
Chaofeng Jia, China Debut