More info at this link.
One more recording from the Berlin Conference:
Based on Dmitry Yemanov’s talk in the Firebird International Conference in Berlin, we may expect Firebird 3.05 and Beta 2 of Firebird 4 to be released in the end of 2019. Firebird 4 RC1 should appear in the first quarter of 2020 and final release in the second quarter of 2020.
The Russian software provider RED SOFT became a platinum sponsor of the Firebird Foundation, which was incorporated in 2002 to provide a way to raise funds to support the developers of the open-source Firebird relational database management system. Thus, the company, which owns its technological stack of software products, including the modern industrial Red Database DBMS, becomes a full and active member of the Firebird international community.