About the re-intoduce this species in Kazakhstan : Revival of Przewalski's horses continues in Kazakhstan. Environment. Tengrinews.kz
This story is familiar to me. I remember the Muenchener Zoo site mentioning the Kazakhstan takhi project! Will check out and come back over it.
Another article about the re-introduction : Studies & Opinions. Reintroducing wild horses to the steppe will be a painstaking process. Tengrinews.kz