I don't speak ukrainian nor russian but i've seen your post with the same question on international forum so i will answer in english. As far as i know there will be 15 different languages available (I believe there was a interview few months ago about it but i'm not sure if I remember that number correctly) However, specific languages were not listed. There hasn't been any announcement yet regarding this matter. Personally i think its doubtful that ukrainian language will be supported. You can expect russian but thats probably not to helpful.Czy planujetsia ukraïnśka lokalizacia gry "Wiďmak 3: Dyka gonytwa"?
P.S.: Wybaczte, szczo zwertajusia ne poľśkoju.