Update: MySQL buys company, hires noted database architect InfoWorld: "Open-source database company My SQL has acquired a small Web application technology company and in the process hired its founder, Jim Starkey, a noted database software architect, MySQL announced on Monday."
This article contains a few errors and spurious suggestions. E.g., Interbase was not the first DBMS with triggers and support for BLOBs; it was also a DBMS product failure, and Digital's RDBMS, which Starkey also designed, failed to put a dent in the DBMS universe (and was eventually sold to Oracle; small world...). The Interbase-based Firebird has some vocal advocates, but it's a deep outlier relative to MySQL and PostgreSQL.
As Starkey notes in this article, the MySQL AB acquisition is focused on Netfrastructure, not anything related to Interbase/Firebird/etc.