Chinese Citizenship & Eventually HK passport.

These requirements are listed in the immigration website.

:your Hong Kong identity card

:your passport(s) or travel document(s) showing your travel records and length of residence in Hong Kong, or any of the following documents:

:letters from your employers certifying the periods of your employment with them

:letters from schools or other educational establishments showing the periods you attended

:Tax returns or a letter from the Inland Revenue Department showing that you have paid taxes in the past years

:any other document showing your residence in Hong Kong

:proof of your relationship with the near relative who supports your application (if applicable), including proof of his or her Chinese nationality and right of abode in Hong Kong, such as a valid travel document and a Hong Kong permanent identity card

:proof of your ‘other reasons’ if you have completed Part 11 of the application form.


http://www.gov.hk/en/residents/immigration/chinese/naturalisation.htm


The processing time is usually around 7 months.

Cantonese is not must but if you know cantonese it helps.

Best to ask Immigration direct, I think. You could get personal opinions here that are not 100% in line with actual requirements.