Rebble is the open source infra that has been keeping Pebbles alive since ~2016. See: rebble.io and https://github.com/pebble-dev

(Disclaimer: I'm part of the team)

RePebble is a new thing by Eric, the original founder of Pebble and is unrelated to Rebble.

> Is Rebble making hardware as well as RePebble?

Potentially! We have always talked about it, but some of the announcements today have thrown us for a loop so plans are still being discussed.

> Is RePebble also open source and community owned like Rebble?

Remains to be seen, but if I had to guess it's unlikely.