When announcing this release, Apple stated the beta had been "scaled back" for compatibility with Mac OS X v10.4.
wˌɛn ɐnˈaʊnsɪŋ ðɪs ɹᵻlˈiːs, ˈæpəl stˈeɪɾᵻd ðə bˈeɪɾə hɐdbɪn "skˈeɪld bˈæk" fɔːɹ kəmpˌæɾəbˈɪlᵻɾi wɪð mˈæk ˌoʊˈɛs ˈɛks vˈiː tˈɛn.fˈoːɹ.