Now everyone should know that Oracle, the big commercial RDBMS vendor, has recently acquired Innobase Oy, the development house behind InnoDB, one of the data storage backend for MySQL that provides ACID compliant transaction support, row-level locking and foreign key constraint. Jeremy Zawodny has this story well covered.
You know you are doomed, when your friend and good helper turns out to be a close relative of your enemy, and that enemy is much richer than you, has bigger names and has been historically ruthless.
Good luck MySQL AB. For the FOSS developers, there are still PostgreSQL and Firebird.