I don't know about kindergarten but we take our 13 month son to Tutor Time Wow for a toddler play group and it is awesome. It's 1/2 Mandarin and 1/2 English (both native speakers). There are many other int'l schools in Kowloon Tong...York, Kingston, Yew Chung, etc.
I don't know about when to enroll but when we interviewed with Yew Chung and Tutor Time, we were basically told that if they start now with one of the Pre-K classes, they can automatically enroll in the Kindergarten class so it might be good to start your child in a pre-K class for that reason as well as many other beneficial educational and social reasons!
