I am very curious about their JS based UI framework (that is referenced in their 2.0 canary release notes). Have you seen anything on this? (Examples etc.)

It appears to be documented here:

https://gitee.com/openharmony/docs/tree/master/en/applicatio...

Some example code here:

https://gitee.com/openharmony/docs/blob/master/en/applicatio...

Apparently made very web like with ui layouts described in hml Huawei markup language rather than html.

Also lots of low level access - you can query the temperature of the battery via one of the apis.

I think its described over here in the docs:

https://developer.harmonyos.com/en/docs/documentation/doc-gu...