Jennifer Ehle will have a part in the film Contagion to be filmed in Chicago, Hong Kong, and Los Angeles; with a scheduled release date of 21 October 2011 (USA)
According to an article at HeyUGuys there's a chance for some travel depending, I suppose, on how small the "small part" is.
"After shooting in Hong Kong, Contagion is also due to film in Minneapolis, Dubai, Japan, Switzerland, The United Kingdom, Brazil, Russia, and Malaysia before its release in October 2011.
She is not yet listed as appearing at imdb but, wow, look at this cast:
Per imdb it's "An action-thriller centered on the threat posed by a deadly disease and an international team of doctors contracted by the CDC to deal with the outbreak."