Found the answer, for anyone else who might need it:
Here are the iOS 8 languages listed in beta 1. Languages that were not in iOS 7 are marked with an asterisk:
Arabic
Catalan
Chinese, Simplified
Chinese, Traditional
*Chinese, Hong Kong SAR China
Croatian
Czech
Danish
Dutch
English
English, British
English, Australian
*English, India
Finnish
French
*French, Canadian
German
Greek
Hebrew
*Hindi
Hungarian
Indonesian
Italian
Japanese
Korean
Malay
Norwegian, Bokmål
Polish
Portuguese
Portuguese, European
Romanian
Russian
Slovak
Spanish
Spanish, Mexican
Swedish
Thai
Turkish
Ukrainian
Vietnamese