Also of interest in the Book Industry Study Group press release on the future of ISBN-13s is the fact that the International ISBN Agency will eliminate language prefixes in the 979 world.
As it stands, ISBN-10s that start with 0 or 1 are from publishers in English-speaking countries (e.g. the US, UK, Canada), e.g.:
0887394302, The Chandler Apartments by Owen Hill, Creative Arts Book Company, Berkeley, California
Those that start with 2 are from French-speaking countries (e.g. France, Belgium, Canada), e.g.:
2070754618, Cher Jean Renoir by Antoine De Saint-Exupery, Gallimard, Paris
Those starting with 3 are from German-speaking countries (e.g. Germany, Austria, Switzerland), e.g.:
3257016581, Der Kontrabass by Patrick Süskind, Diogenes, Zürich
Most countries don’t fall into the national groups, and have their own blocks, e.g. Bangladeshi ISBNs start with 984.
