Hey Ruplesh,
I responded to your question on SO
But if you want to read it here too:
ad 1. the every 3 weeks frequency just stopped after 7.73.0.Final We see more future in Kogito so there is regular community releases.
ad 2. JBPM is in maintenance, but we haven't stopped any bug fixing and we plan to release it if there will be big fixes or demand for that.
Regards,